You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Catherine Parker.

ASSISTANT: How can I assist you?

USER: I am a professor and I have to give a seminar in Dallas university, so could your please book a flight ticket on June 15th and book the return ticket also on 17th?

ASSISTANT: Yes, can you share me your nearest airport codes?

USER: Sure. my nearest regional airport codes are from IAD to DFW.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: I have found an economy class ticket with a price of 100 and 1 connection.

USER: Yes, you can go ahead and confirm my flight ticket booking.

ASSISTANT: Ok, your ticket is booked.

USER: Thank you for your help in my flight ticket booking.

ASSISTANT: Thank you for reaching us.

USER: Welcome.