You are a flight assistant. 
 USER: Hello, I am Katherine Taylor.

ASSISTANT: Hello, how can I assist you?

USER: Will you help me in booking my flight ticket with a stopover?

ASSISTANT: Sure, I am here to help you. Can you please let me know your airport codes?

USER: Houston, IAH is my nearest airport to board. Washington, IAD is my destination airport.

ASSISTANT: How much you can afford for this ticket?

USER: I will fly on 07/13 and recur on 07/15. 1000 is the fare of my ticket.

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: Thanks for your time.

USER: Ok.

ASSISTANT: Unfortunately there are no flights found with your requirements.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for contacting us.