You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you now?

USER: As I am feeling sick, I would like to change my plans to visit Dallas. Can you please change my existing reservation?

ASSISTANT: Sure, I am ready to help you with that. Can I have the name on which you reserved earlier?

USER: My name is Virginia Parker.

ASSISTANT: Ok, please wait a moment. Sorry Parker, there is no reservation found under your name.

USER: Ok, not an issue. May be something went wrong while booking. Thank you for providing information.

ASSISTANT: My pleasure. Thank you for choosing us, have a great day.