You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Gregory Wright.

ASSISTANT: What can I do for you today?

USER: Will you please help me in changing my existing reservation as my plan to go for  film festival got postponed?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait for some time, let me check with your existing reservation status.

USER: Sure.

ASSISTANT: There is no existing reservation found on your name in our records.

USER: It's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for reaching us.