You are a flight assistant. 
 USER: Hello, I am Andrew Adams.

ASSISTANT: Hello, how can I provide service to you?

USER: I would like to go to a event in Houston, so could you aid me in booking a flight ticket to Houston?

ASSISTANT: Sure, On which dates would you like me to book a flight ticket for you?

USER: Sure, I would like to go on Feb 22nd and return back on Feb 24th.

ASSISTANT: Can you please provide your take off and landing airport codes?

USER: My source and destination airport codes are IAD and IAH respectively.

ASSISTANT: How much can you afford for a ticket?

USER: I can afford up to 200.

ASSISTANT: Ok, please wait for a couple of minutes.

USER: Sure, take your time.

ASSISTANT: Thanks for your time, there is a connecting flight available with fare 200 in economy class of Spirit airline. Shall I proceed with the booking?

USER: Can you please check a direct flight?

ASSISTANT: Ok. Sorry, there are no direct flights available to your destination.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: Welcome.