You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I am David Harris. As my schedule of going to my head office got postponed, can you help me in changing my reservation?

ASSISTANT: Sure, please wait for a moment.

USER: OK.

ASSISTANT: Thanks for waiting, no reservation found with your name.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thanks for availing us.