Could you ask him to call me back, please? He can reach me at 7644156.

:

• You are trying to talk to Mr. Jones on the phone, but the receptionist tells you that he is not at work today.
• S/he also asks you if you want to leave a message.
• Could you...please? This is the polite way of making requests.
• Call me back. When you see the word back with any verb, it means return.
• You called him, now he has to return the call - call you back.
• He can reach me at… This expression means that if he calls (this number) he will find me.

This sentence is an example of telephones, business.