You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Rebecca Johnson.

ASSISTANT: How may I guide you?

USER: Actually, I booked a ticket to BOS to attend a party but the party is postponed.

ASSISTANT: Ok, so do you want me to change your existing reservation?

USER: Yes, can you help me out.

ASSISTANT: Sure, please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry, I could not find any reservation with your name.

USER: That's ok. Thank you for your time.

ASSISTANT: Thank you, have a good day.