You are a flight assistant. 
 USER: Hi. I am Barbara Carter.

ASSISTANT: Hello, how may I aid you?

USER: I had planned to go on a vacation, but it was postponed due to some personal reasons. Can you change my existing reservation?

ASSISTANT: Sure, please wait a minute.

USER: Sure.

ASSISTANT: Thank you for being patient. Unfortunately there is no reservation found by your name.

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

ASSISTANT: Thank you for reaching us.