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

ASSISTANT: Hello, how may I aid you?

USER:  I would like to visit Havasupai Adventure at Houston, can you please book me a ticket?

ASSISTANT: Sure, help me with your depart and arrival dates.

USER: I want to travel on 07/11, and need to catch return flight on 07/13.

ASSISTANT: Mention your airport codes.

USER: Source is from DCA and destination is to HOU.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: We found a flight on AA airline, flight number 1011 with the fare of 100.

USER: Please proceed with the booking.

ASSISTANT: Your ticket has been booked.

USER: Thanks for your kind help.

ASSISTANT: Thank you for approaching us.