You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Robert Thomas here.

ASSISTANT: Robert. how may I render you today?

USER: I want to meet my uncle at Washington. Can you please help me in booking a flight ticket?

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: My preferable travelling dates are from 04/23 to 04/25.

ASSISTANT: Ok, may I know your airport codes please?

USER: Sure, my origin and destination codes are from IAD to SEA.

ASSISTANT: Thanks for providing all necessary details, please wait for a while, I will check the best flight for you.

USER: Ok, take your time.

ASSISTANT: I found a flight for you with Frontier airline and it costs you 300. Shall I proceed to reserve a seat in this particular airline?

USER: Ok, please reserve that flight ticket.

ASSISTANT: Your ticket has been booked with 1021 flight number.

USER: Thank you for your service.

ASSISTANT: Welcome, thank you for choosing us. Have a safe flight.