You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, we are here to help you. Wait for some time I will check the reservations on your name.

USER: Ok, take your time.

ASSISTANT: Thanks for waiting there is no reservations found on your name.

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

ASSISTANT: Thanks for choosing us.