You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you out/.

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

ASSISTANT: Sure, I will help you in changing the ticket.

USER: Ok.

ASSISTANT: Sorry, there are no reservations found.

USER: That's ok. Anyways, thank you.

ASSISTANT: Thank you for choosing us.