You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I be at your service?

USER: I am unable to change my reservation, can you please change my reservation?

ASSISTANT: Sure, I can help you with that. May I know your name to check the list and get back to you?

USER: Sure, my name is Thomas White.

ASSISTANT: Ok, please wait.

USER: OK.

ASSISTANT: We could not find any reservation by this name in our data base.

USER: Ok, no problem. Thanks for the information.

ASSISTANT: Thank you for approaching us.