1803
“ Delta has received reports of attempts by parties not affiliated with us to fraudulently gather customer information in a number of ways including : fraudulent emails , social media sites , postcards , Gift Card promotional websites claiming to be from Delta Air Lines and letters or prize notifications promising free travel , ” states the Delta Air Lines warning .
 ( phishing: claiming to be,  fraudulent emails: tool, Delta Air Lines: trusted entity, letters: tool, prize notifications: tool, gather customer information: purpose, promising free travel: attack pattern, social media sites: tool, postcards: tool, Gift Card promotional websites: tool) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: phishing, data breach, ransom, discover vulnerability, patch vulnerability, Arguments type: vulnerable system, capabilities, vulnerability, number of victim, issues addressed, compromised data, damage amount, common vulnerabilities and exposures, victim, patch number, number of data, tool, discoverer, time, purpose, place, payment method, releaser, vulnerable system version, attacker, supported platform, patch, price, vulnerable system owner, trusted entity, attack pattern. 
Text: {0} 
Answer:
 ( phishing: claiming to be,  fraudulent emails: tool, Delta Air Lines: trusted entity, letters: tool, prize notifications: tool, gather customer information: purpose, promising free travel: attack pattern, social media sites: tool, postcards: tool, Gift Card promotional websites: tool) 