You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

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: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: Can you please share your name?

USER: Sure, my name is Sarah Wilson.

ASSISTANT: Please hold on a moment.

USER: Ok.

ASSISTANT: Sarah Wilson, no reservation has been found on your name in our database.

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing us.