You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Gregory Walker.

ASSISTANT: How may I assist you?

USER: I want to book a flight ticket to visit Houston Zoo IAH, can you help me with booking  a connecting flight?

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please?

USER: My travelling dates are July 09 and July 11.

ASSISTANT: May I know your origin airport code please?

USER: My origin airport code is LAX.

ASSISTANT: How much you can spend for airfare?

USER: I can afford up to 5000.

ASSISTANT: Wait a moment please, let me check with that.

USER: Sure.

ASSISTANT: Southwest airlines is available in your route with the ticket fare of 100, shall I proceed with the booking?

USER: Please proceed.

ASSISTANT: Your ticket is booked with the flight-1004 in economy class.

USER: Thank you.

ASSISTANT: Thank you for reaching us.