You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

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

ASSISTANT: Sure, I am here to help you. May I know your name to check with the status?

USER: I am David Evans.

ASSISTANT: Please wait a moment.

USER: Ok, take your time.

ASSISTANT: David Evans, there is no active reservation found under your name to amend.

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

ASSISTANT: Thank you for reaching us.