You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: My son is giving a presentation on international competition, but due to some sudden changes , I want to change my existing reservation. Could you help me?

ASSISTANT: Sure, may I know your name for changing reservation?

USER: I am Jessica Jackson.

ASSISTANT: Ok, please wait a moment. No reservation found on your name Jessica Jackson.

USER: Ok, no problem, thank you for your valauable information.

ASSISTANT: Thank you for approaching us.

USER: Welcome.