You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I would like to change my reservation, can you please help me out with that?

ASSISTANT: Sure, I am here help you out.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Donald Williams here.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: We found any reservation, can you please share your airport codes?

USER: Sure, my airport codes are PHX and AUS.

ASSISTANT: May I know your travelling dates please?

USER: My travel dates are from Apr 27 to Apr 29.

ASSISTANT: Is there any connection limit?

USER: I am looking for a connecting flight.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Delta airlines is providing connection flight for you with the fare of 100 in economy class, shall I proceed with the booking?

USER: Ok, please proceed.

ASSISTANT: Your ticket is booked with the flight-1007.

USER: Thank you for your service.

ASSISTANT: Thank you for choosing us.