You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: My name is Barbara Wilson.

ASSISTANT: How may I help you?

USER: I had a quarrel with my friend and I got injured. I would like to postpone my journey. Can you please change my existing reservation?

ASSISTANT: Sure, I will help you. Please wait a moment.

USER: Ok.

ASSISTANT: Barbara, no reservation has been found on your name in our records.

USER: Its ok, thank you for the information.

ASSISTANT: Thank you for choosing us.