You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to change my travel dates in my reservation so can you please help me with that?

ASSISTANT: Sure, I am here to help you out.

USER: Thank you for your response.

ASSISTANT: Can you please help me with your name?

USER: Sure, my name is Nicole Thomas.

ASSISTANT: Wait a moment please.

USER: Ok.

ASSISTANT: Nicole Thomas, we haven't found any reservation  under your name in our database to change.

USER: Oh! It's ok, no problem. Thank you for your information.

ASSISTANT: Thank you for choosing us.