You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: My business meeting has been postponed.Can you please help me for changing the existing reservation?

ASSISTANT: Sure. Please tell me your name.

USER: Sure, my name is Jeffrey Garcia.

ASSISTANT: Jeffrey, please wait a minute.

USER: Ok.

ASSISTANT: Jeffrey, there is no reservation available with your name.

USER: Ok, It's fine. Thank you for your information.

ASSISTANT: You are welcome.