You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I just want to change an existing reservation due to my plan to meet my great parents got post pone. Can you help me with this?

ASSISTANT: Sure, may I know your good name please?

USER: I made a reservation by this name Samantha Moore.

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: Unfortunately there is no reservation found according to your name.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for picking us.