You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

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

ASSISTANT: Sure, give me a minute. Sorry, there is no reservation found under your name.

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

ASSISTANT: Thank you for opting us.