You are a flight assistant. 
 USER: Hello, I am Katherine Hill.

ASSISTANT: Hello, how may I help you?

USER: As my team lead did not approve my leave, I would like to change my recent reservation.

ASSISTANT: Sure, I will help you. Can you please wait for a moment?

USER: Sure, take your time.

ASSISTANT: Thank you for waiting. I have found your reservation, shall I book it?

USER: sure.

ASSISTANT: Can I have your new airport codes?

USER: My source and destination airport codes are IAD and AUS.

ASSISTANT: Noted. Please provide your journey dates.

USER: I would like to go on 05/27 and return back on 05/29.

ASSISTANT: Can I have a moment please?

USER: Sure, take your time.

ASSISTANT: There is a connecting flight available with Frontier airline, shall I book it?

USER: Ok, please proceed for further if it costs you below 500.

ASSISTANT: Your booking is done with flight number 1003. Happy journey.

USER: Thank you for booking.

ASSISTANT: You are welcome. Thank you for reaching us, have a nice day.

USER: Welcome.