You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I serve you today?

USER: I am Shirley Turner, please help me with changing my reservation.

ASSISTANT: Sure, wait a moment I will check weather this reservation available or not.

USER: Ok.

ASSISTANT: Thanks for waiting, unfortunately there is no reservation found by this name.

USER: That's fine, thanks for the information.

ASSISTANT: Thanks for choosing us.