You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: Can you help me in modification of my reservation as I am not able to make my trip?

ASSISTANT: Sure, may I know your name please?

USER: Sure, my name is Charles Scott.

ASSISTANT: I am sorry no reservation found on your name.

USER: Not a problem, anyways thank you for the information.

ASSISTANT: Thank you for choosing us.