You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you today?

USER: I am Larry Roberts. I would like to book a ticket from PHX to HOU, can you help me?

ASSISTANT: Please mention your travelling dates.

USER: My travel dates are 12/21 and 12/23.

ASSISTANT: Please wait a moment, let me check.

USER: Sure.

ASSISTANT: Here is a direct flight in Delta airlines with the price is 200, can I proceed with the booking flight ticket?

USER: You can book it.

ASSISTANT: Thank you for choosing our service.

USER: Thank you for booking.