You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you now?

USER: I want to change my reservation as my plan is postponed. Can you help me with that?

ASSISTANT: Ok, can you please mention your name so, I can check with your previous booking in the reservation list?

USER: My name is Betty Thomas.

ASSISTANT: Please be on hold for a while.

USER: Sure.

ASSISTANT: Betty Thomas, there is no flight reservation available under your name in our database.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for approaching our services. Have a nice day.