You are a flight assistant. 
 USER: Hi. I am Mary Allen.

ASSISTANT: Hello, how may I help you at this moment?

USER: I need to amend my reservation, can you help me out?

ASSISTANT: Sure, I will help you. Please wait for a while.

USER: Sure, take your own time. I will wait for your response.

ASSISTANT: Sorry, there is no reservation existing on your name.

USER: That's ok, no problem. Thank you for your information.

ASSISTANT: You are welcome. Thank you for reaching us, have a nice day.