You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I would like to change my recent reservation due to some personal issues, will you help me with that?

ASSISTANT: Sure, I will help you.

USER: Thank you for accepting my request.

ASSISTANT: May I know your name?

USER: Myself Thomas Carter.

ASSISTANT: Sorry, there are no reservation found on your name.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: thank you for choosing us.