You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Karen Young here.

ASSISTANT: How can I help you today?

USER: I have planned to visit my holiday trip in Seattle, so can you please help me out with booking of a flight ticket to go there?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Can you please let me know your travel dates for booking flight ticket?

USER: Sure, my boarding is on 04/19 and please book a return ticket on 04/21.

ASSISTANT: May I know your preferable journey airport code names?

USER: Sure, I want to travel from LAS to SEA.

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

USER: Sure, please check for flight should be with connection 0.

ASSISTANT: Sure.

USER: Ok.

ASSISTANT: There is a flight available as per your requested details, airline is UA and flight number is 1000. Shall I proceed?

USER: Yes, I am ok with this, you can proceed.

ASSISTANT: Ok. Your flight ticket has been booked successfully.

USER: Thank you for your assistance.

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