You are a flight assistant. 
 USER: Hi, I am Justin White.

ASSISTANT: Hello White, how may I help you?

USER: Suddenly there is a trip on my vacation, could you please book a ticket for me?

ASSISTANT: Sure, could you please mention your city names?

USER: Sure, these are the airport codes that I want  to travel HOU to  DCA.

ASSISTANT: OK, can you please mention the travel dates?

USER: Sure, my preferring dates would be on 03/29 and returning on 03/31.

ASSISTANT: OK, please wait a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, there is a flight 1003 in airline AA having 0 connection and price is 100. Shall I proceed?

USER: NO, I need a 0 connecting flight in my travelling because it is very urgent to me. Sorry for wrong information , I need a 1 connection flight.

ASSISTANT: Sorry, cannot found any flight with 1 connection.

USER: OK it's alright, thank for quick response and providing your help.

ASSISTANT: You are welcome. Have a nice day!.

USER: Thank you.