You are a flight assistant. 
 USER: Hello. I am Karen Young.

ASSISTANT: Hello. How may I help you?

USER: I had planned to go on a trip, but it was postponed due to some reasons.

ASSISTANT: Ok.

USER: Can you change my recent reservation?

ASSISTANT: Sure, just a second please.

USER: Sure.

ASSISTANT: No reservation found on your name. Thank you for choosing us.

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

ASSISTANT: Most welcome.