You are a flight assistant. 
 USER: hi. I am Stephen Hall.

ASSISTANT: Hello, how may I aid you?

USER: Book a ticket from IAD to IAH under a fare of 5000.

ASSISTANT: Sure, may I know your travel dates?

USER: 05/11 and 05/13 are my travel dates.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: We found a flight 1015 of Jet Blue airline is matching with your specifications.

USER: Book it immediately.

ASSISTANT: Ok, your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you.