You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I serve you?

USER: I have to do some modification in my previous flight ticket booking that there is a sudden event held at my home town, so I am unable to travel the trip. can you please help me?

ASSISTANT: Sure, I can help you out with that. Can you please tell me your name?

USER: Sure, my name is Christine Edwards.

ASSISTANT: Ok, please give me a minute to check your previous ticket.

USER: Yes, take your time.

ASSISTANT: Sorry Christine Edwards, I have not found any active reservation under your name to modify.

USER: That's fine, I can book another ticket when I have planned. Thank you for your help in searching.

ASSISTANT: My pleasure. Thank you for choosing us.

USER: Welcome.