You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I need to change my reservation due to my doctor appointment has been postponed. Can you help me in changing?

ASSISTANT: Sure, we are here to help you. May I know your name?

USER: Amy Collins is my name.

ASSISTANT: Ok, wait for some time.

USER: Sure.

ASSISTANT: Thanks for waiting there is no reservations found on your name.

USER: Ok, no issues. Thanks for your information.

ASSISTANT: Thanks for choosing us.