You are a flight assistant. 
 USER: Hello, I am Elizabeth Evans.

ASSISTANT: Hello, how may I serve you at this moment?

USER: I would like to write my GRE exam in New York, so could you please book a ticket to me?

ASSISTANT: Sure, send me your travel dates.

USER: Sure, I would like to travel on 03/24 and return back on 03/26.

ASSISTANT: Please provide your nearest airport codes.

USER: My source and destination airport codes are PHL and EWR.

ASSISTANT: Please wait for a moment.

USER: Ok, take your time.

ASSISTANT: Thank you for waiting. There is a flight available with Frontier airlines, shall I book 1 seat for you?

USER: Ok, please proceed if it is a direct flight.

ASSISTANT: Sorry, all direct flights are booked before 2 months.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.

USER: Welcome.