You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you now?

USER: I had planned to go on a trip, but it was postponed. Can you change my recent reservation?

ASSISTANT: Yes, may I know your name please?

USER: I am Jacob Smith.

ASSISTANT: I am very sorry to say, there is no active reservation by your name.

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

ASSISTANT: Thank you for choosing our agency.