You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How may I help you?

USER: I am Thomas Walker.

ASSISTANT: Ok.

USER: Book a ticket from DCA to SFO under 200 fare.

ASSISTANT: Sure, may I know your trip dates?

USER: My travel dates are as 11/18 and 11/20.

ASSISTANT: I found a direct flight to your destination. Shall I proceed?

USER: Proceed please.

ASSISTANT: Your flight ticket is booked.

USER: Thanks a lot.

ASSISTANT: Flight number: 1007 , airline: Hawaiian. Thank you.