You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: Could you please change my existing reservation due to postpone of my trip?

ASSISTANT: Sure, will you please let me know your name?

USER: My name is Linda Thomas.

ASSISTANT: Ok, let me check the current status and revert you.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no reservation found active under your name in our data base.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for picking us.