You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, may I know how best I can help you today?

USER: I need your help in changing my reservation as my scheduled got postponed. Can you help me with that?

ASSISTANT: Sure, I can help you in that.

USER: Thank you and please check the reservation with my name Jennifer Lee.

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: Sorry to inform that, there is no active reservation found on your name.

USER: Not a problem, it might not booked properly at the time of booking. Anyways thank you for the information.

ASSISTANT: Thanks for contacting us.