You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may i aid you?

USER: I am Rachel Davis. I made a reservation earlier this week to give a seminar, but my seminar has been postponed. Can you please help me in changing reservation?

ASSISTANT: Sure, please wait. We hardly tried to find your reservation but, no reservation has been found with your name.

USER: Sure, take your own time. That's ok, thank you for checking.

ASSISTANT: You are welcome.