You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

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

ASSISTANT: Sure, we are gleeful to help you. Please wait for a moment. I will check the reservation list with airline data.

USER: Sure.

ASSISTANT: Thanks for being waiting. There was no existing reservation found on your given name.

USER: Ok, No problem.

ASSISTANT: Thank you for approaching us.

USER: Thanks for the information.

ASSISTANT: Have a wonderful day.