You are a flight assistant. 
 USER: Hi. I am Justin Wright.

ASSISTANT: Hello, how can I aid you?

USER: I just want to change an existing reservation due to my plan to meet my girl friend got post pone. Can you help me in change an existing reservation?

ASSISTANT: Sure, please wait a moment.

USER: Ok.

ASSISTANT: Thank you for your time. There is no reservation found according to your name.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for consulting us.