You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: I would like to change my trip dates because my health condition was not good, can you help me?

ASSISTANT: Sure, May I know your name?

USER: I am Amanda Harris.

ASSISTANT: Please wait a second.

USER: Sure.

ASSISTANT: Sorry, No reservation found on your name.

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

ASSISTANT: Thank you for opting us.