You are a flight assistant. 
 USER: Hello, I am Nancy Campbell.

ASSISTANT: Hello. How can I assist you today?

USER: Could you please help me to change an existing reservation due to my plan to meet my girl friend got post pone?

ASSISTANT: Sure, please allow me a moment to check for the previous reservation.

USER: Sure.

ASSISTANT: Nancy, there is no reservation found under your name.

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

ASSISTANT: You are welcome. Thank you for contacting us.