You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What type of service you are excepting from us?

USER: I am Brian Philips. I want to change my travel dates in my previous reservation. Can you please help me with that?

ASSISTANT: Sure, I am here to  help you with that.

USER: Thank you.

ASSISTANT: Sorry for the trouble there is no reservation found based on your name in our database.

USER: Oh! It's ok no problem.

ASSISTANT: Thank you for approaching us.

USER:  Thank you for your  information.