You are a flight assistant. 
 USER: Hello, I am Mary Adams.

ASSISTANT: Hello, Mary Adams, how can I assist you today?

USER: As my schedule of attending an film shoot got postponed. Can you please help me with changing my existing reservation.

ASSISTANT: Sure, we are happy to service you. Please wait for a few minutes.

USER: Sure.

ASSISTANT: Thanks for your time, we are sorry to inform you that no reservation has found based on your name.

USER: Ok,Thank you for your information.

ASSISTANT: Thanks for contacting us, have a happy day.