Provide the theme summaries for the following conversation: 

#Person1#: Good afternoon. ABC company. May I help you?
#Person2#: Yes, may I speak to Mr. James Potter, please?
#Person1#: I'm afraid Mr. James Potter isn't available right now. Would you like to leave a message?
#Person2#: This is Martin Richard with Sun Electronics. It's very important that he returns my call this afternoon.
#Person1#: Does he have your office number and your mobile phone number?
#Person2#: I think so. but let me give them to you again.
#Person1#: Okay.
#Person2#: My office number is 714-888-3765; my cell phone number is 909-333-8739. He can reach me at my office number before 6:00 p.m. or anytime today on my mobile.
#Person1#: Very well. I'll give him your message as soon as he returns to the office.

Summary: 
Martin phones to speak to James but James isn't available. Martin says it's very important that James returns his call this afternoon and gives #Person1# his phone number.