You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am Scott Jackson. I need modify my travel dates, can you help me in amending the reservation?

ASSISTANT: Sure, please wait a while.

USER: Sure.

ASSISTANT: Sorry to say, there is no reservation on your name.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for opting us.