You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. Hello.

USER: Can you please help me in changing my reservation details? As my trip has been postponed.

ASSISTANT: Sure, I will help you with that. May I know your name please?

USER: Sure, my name is Sharon Thomas.

ASSISTANT: Sharon, please wait for a while.

USER: Sure.

ASSISTANT: I am sorry to say that there is no reservation found under your name.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for reaching us. Have a great day.