You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Debra Wilson. There is a meeting that my management is informed suddenly, so I have postponed my trip. Can you please help me in changing my previous flight ticket?

ASSISTANT: Sure Debra Wilson, please wait a moment.

USER: Sure, I will wait for your replay.

ASSISTANT: There is no reservation found on your name to change it.

USER: Ok, no issue with that one. Thank you for your information.

ASSISTANT: Thanks for contacting us.

USER: You are welcome.