You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: Owing to an emergency, I would like to change my plans to visit Los Angeles on other day. Could you help me in changing the existing reservation?

ASSISTANT: Sure, may I know your name please?

USER: My name is Kimberly Thomas.

ASSISTANT: Please be on hold, let me check.

USER: Sure, take tour own time.

ASSISTANT: Thank you for waiting, I have not found any reservation by your name.

USER: Ok, no problem.

ASSISTANT: Thank you for choosing us, have a nice day.

USER: Thank you for your information.