You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am John Moore.

ASSISTANT: How can I guide you at this moment?

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 will help you with this. Please be on hold for a moment to check your reservation status.

USER: Ok.

ASSISTANT: John Moore, there is no active reservation found under your name in our database.

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

ASSISTANT: Thank you for utilising our service.