You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you at this moment?

USER: I am William Martin. Due to some entrepreneurship meeting, I am going to change my existing reservation. Can you please help me in changing the reservation?

ASSISTANT: Sure, I will aid you.

USER: Thank you.

ASSISTANT: I found your reservation, can you share me your trip dates?

USER: My new travelling dates are from Sept, 29 to Oct, 01.

ASSISTANT: Please provide your source and destination airport codes.

USER: My airport codes are SFO to PHX.

ASSISTANT: Just give a moment.

USER: Sure.

ASSISTANT: I found a flight with 1 connection having airfare is 200 and flight-1007. Shall I proceed to booking?

USER: Please proceed with the booking.

ASSISTANT: Your ticket is confirmed in economy class.

USER: Thank you.

ASSISTANT: Thank you for contacting us.