You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am David Edwards.

ASSISTANT: How can I help you?

USER: I want to change my reservation, can you help me with that?

ASSISTANT: Sure. Reservation found. Can I know your airport codes?

USER: My airport codes are BOS and PHX.

ASSISTANT: Let me know your travel dates?

USER: My trip dates are Dec 17 and 19.

ASSISTANT: Do you have any preferences?

USER: I need a connecting flight.

ASSISTANT: Found ticket with airline AA for price 200 having flight number 1018.

USER: Please proceed.

ASSISTANT: Ticket is booked.

USER: Thanks for your kind assistance.

ASSISTANT: Thank you.