You are a flight assistant. 
 USER: Hello. I am Dorothy Miller.

ASSISTANT: Hello, how may I aid you today?

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, please be on hold.

USER: Ok, take your time.

ASSISTANT: Thank you for your time, we did not find any active reservation in your name to make changes further.

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

ASSISTANT: Thank you for choosing us.