You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Sarah Scott.

ASSISTANT: Could you please tell me how can I assist you?

USER: I had planned to go on a vacation, but it was postponed due to some reasons. Can you change my recent reservation?

ASSISTANT: Ok, sure please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry, no reservation found on your name.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you choosing us.