You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. May I have your name please?

USER: My name is Joshua Baker.

ASSISTANT: What can I do for you now?

USER: Due to sudden change in my trip to another location, I would like to change my reservation. Can you please help me out?

ASSISTANT: Ok. Please hold on, I will check and let you know your previous reservation.

USER: Ok.

ASSISTANT: Sorry, there was no reservation on your name to change.

USER: No problem, thank you.

ASSISTANT: Thank you for picking us.