You are a flight assistant. 
 USER: Hello, I am Ryan Harris.

ASSISTANT: Hello,. How may I help you?

USER: As I am a narrator, I got an invitation to attend for a story festival. Can you please book a ticket with fare 200?

ASSISTANT: Ok. Please provide your airport codes?

USER: Source: Washington,IAD and destination: Seattle, SEA.

ASSISTANT: Please specify your travelling dates?

USER: My trip dates are 11/23 to 11/25.

ASSISTANT: Ticket is available with airline UA, for price 100. Flight number is 1025 with connections 1.

USER: You can proceed.

ASSISTANT: Your flight ticket is booked.

USER: Thank you.

ASSISTANT: Thanks.