You are a flight assistant. 
 USER: Hi. I am Melissa Brown.

ASSISTANT: Hello, how may I serve you today?

USER: I need to schedule my trip to Washington for attending a business meeting. So, Can you help me in searching a flight ticket with fare of 5000?

ASSISTANT: Sure, may I know your travelling dates?

USER: I will start my journey on 12/07 and again I will be back on 12/09.

ASSISTANT: I need your selected airport code, that you wish to board from.

USER: My source airport code is Phoenix, AZ - PHX.

ASSISTANT: Do you require a halt in between your journey?

USER: I am comfortable with any flight.

ASSISTANT: To proceed further, please help me with destination airport code.

USER: My destination airport code is DC - IAD.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: We found a connecting flight for you, flight details are as Delta airline, fare 100 and flight number 1000.

USER: Proceed with my booking.

ASSISTANT: Your booking has been confirmed.

USER: Thank you for your help.

ASSISTANT: Thank you for opting us.