You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you today?

USER: As my meeting got postponed, I need your help in changing my recent reservation details. Can you please help me with that?

ASSISTANT: Sure, for changing we need your name. Please provide it.

USER: Sure, my name is Shirley Lopez.

ASSISTANT: Please stay online, we will help you in changing reservation.

USER: Sure, I'll wait.

ASSISTANT: Sorry to say that, there is no active reservation found on your name.

USER: Oh! May be I have done a wrong booking. Thank you anyways.

ASSISTANT: Thank you for communicating with us.