You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What can I do for you today?

USER: Due to an emergency, I would like to postpone my meeting. Can you help me in changing my existing reservation?

ASSISTANT: Sure, I will help you that. Give me a minute.

USER: Sure.

ASSISTANT: Can I please have your name?

USER: My name is Karen Jones.

ASSISTANT: I am sorry to say that there is no reservation found on your name.

USER: That's fine, thank you for the information.

ASSISTANT: Thank you for reaching us. Have a nice day.