You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Actually my friend reserved a ticket but he is unable to travel on planned dates, so can you cancel his ticket?

ASSISTANT: Sure, please tell your name?

USER: Sure, I am Melissa Mitchell.

ASSISTANT: Sorry, there is no reservation found on your name?

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you and have a nice day.