You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I want to change my reservation, due to some problems I am not unable to travel those dates so can you please change my travel dates?

ASSISTANT: Sure, may I know your name to check for the previous reservation?

USER: Sure, my name is Steven Wilson.

ASSISTANT: Please allow me a moment to check for the previous reservation.

USER: Ok.

ASSISTANT: Steven, there is no reservation found under your name.

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

ASSISTANT: Thank you for contacting us.