You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Sharon White.

ASSISTANT: How may I help you?

USER: 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 am here to help you, please wait a moment I will check your reservation status.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found under your name.

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

ASSISTANT: Thanks for contacting us.