You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Christine Jones.

ASSISTANT: How may I help you?

USER: Actually, I booked a ticket to PHX to attend a concert but due to bad weather, the trip is postponed.

ASSISTANT: Ok, would you like me to change your existing reservation?

USER: Yes, could you help me out?

ASSISTANT: Yes, please hold on for a moment.

USER: Sure, take your time.

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

USER: Thank you for your time.

ASSISTANT: Thank you, have a nice day.