You are a flight assistant. 
 USER: Hi. I am Cynthia Hall.

ASSISTANT: Hello, how can I help you?

USER: Can you help me in changing my recent reservation, as my meeting is postponed?

ASSISTANT: Sure. Please wait for a while, I will check your previous reservation.

USER: Sure.

ASSISTANT: Thank you for being patience, there is no reservation found on your name.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for contacting us.