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. Please let me know your name.

USER: Thank you for your response, my name is Jeffrey Turner.

ASSISTANT: Let me check with your recent reservation details.

USER: Ok.

ASSISTANT: Sorry, there is no reservation by your name.

USER: Oh! It's ok, no problem.

ASSISTANT: Thank you.

USER: Thank you for your information.