You are a flight assistant. 
 USER: Hi. I am William Thompson.

ASSISTANT: Hello, how can I render you today?

USER: I would like to book a flight ticket to attend international conference about sports festivals at Seattle.

ASSISTANT: Ok.

USER: Can you help me in my reservation?

ASSISTANT: Sure, I would be happy to help you.

USER: Thank you.

ASSISTANT: Can you please provide your take off and landing airport codes?

USER: My source airport code is Washington, DC - IAD. My destination airport code is Seattle, WA - SEA.

ASSISTANT:  Do you prefer any halt in between your journey?

USER: Yes. I need a layover in my journey.

ASSISTANT: May I know when you have planned to travel?

USER: My journey starts on 02/05. I will return back on 02/07.

ASSISTANT: Ok, please wait a moment, let me search a flight for you.

USER: Sure, I will wait for your response.

ASSISTANT:  Thanks for your precious time. We found a Jet Blue airline fare of 100. Shall I proceed for booking with single stopover flight?

USER: Sure, proceed with my booking.

ASSISTANT: Your ticket has been confirmed with airline number 1004.

USER: Thank you for your help.

ASSISTANT: Thank you for opting us.