You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. how may I assist you?

USER: I have reserved flight ticket wrong dates so I want to re-modify my travel dates, can you please help me in that?

ASSISTANT: Sure, I am here to help you out. May I know your name please?

USER: Jeffrey Hall.

ASSISTANT: Wait a moment.

USER: Ok.

ASSISTANT: Jeffrey Hall, we haven't found any reservation under your name.

USER: It's ok. Thank you.

ASSISTANT: Thank you for choosing us.