You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, Can I know your name?

USER: Robert Johnson here.

ASSISTANT: How can I aid you?

USER: Due to an emergency, I want to change my reservation dates. Can you help me?

ASSISTANT: Sure, Please wait a while.

USER: Ok.

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

USER: Ok, No problem.

ASSISTANT: Thank you for choosing us.

USER: Thanks for quick response.