You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

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

ASSISTANT: May I know your name?

USER: I am Anna Robinson.

ASSISTANT: Sorry, we did not found any reservation under your name.

USER: That's ok. Anyways, thank you.

ASSISTANT: Thank you for reaching us.