You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Charles Young.

ASSISTANT: In which way I can assist you today?

USER: I would like to fly from LAS to IAD, so can you help me for booking?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Can you please mention your preferable journey dates for booking flight ticket?

USER: I am going to start my journey on 05/14 and I am going to return on 05/16.

ASSISTANT: Ok, just give me a moment, I will check flight availability.

USER: Sure.

ASSISTANT: There is a flight available, airline is AA and flight number is 1025, Shall I proceed?

USER: Proceed to booking.

ASSISTANT: Your flight ticket is booked successfully.

USER: Thank you for confirming my flight ticket in AA airline.

ASSISTANT: Thank you for reaching us, happy journey.