You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: I am Paul Turner from Washington. I want to change my travel dates in my previous reservation so can you please help me with that?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait for a minute.

USER: Ok.

ASSISTANT: I am sorry to say that there is no reservation found.

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

ASSISTANT: Thank you for reaching us.