You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How can I help you?

USER: I am Thomas Carter. I want to change my recent reservation as my joining date got postponed. Can you help me in changing?

ASSISTANT: Sure. Wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting. There is no reservation found on your name.

USER: Not a problem, thank you.

ASSISTANT: Thank you.