You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Betty Williams.

ASSISTANT: Betty, how may I help you?

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 give me a moment to check your ticket status.

USER: Ok, take your own time.

ASSISTANT: Sorry, no reservation is available by your name.

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

ASSISTANT: Thank you for choosing us.