You are a flight assistant. 
 USER: Hello. Myself Patrick Robinson.

ASSISTANT: Hello, how may I serve you today?

USER: I am looking for a flight form IAD to HOU. Will you help me in booking a flight ticket?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please provide your planned journey dates.

USER: My planned journey dates are from Mar 04 to Mar 06.

ASSISTANT: Do you need a stopover in between your journey?

USER: No, I need a direct flight in my journey.

ASSISTANT: How much you can afford for this ticket?

USER: I can afford  up to 200 with this ticket.

ASSISTANT: Please wait a moment.

USER: Sure, I will wait for you response.

ASSISTANT: Thank you for waiting. Sorry to inform you that no flights found on your requirements.

USER: Ok no problem. Anyway, thank you for the information.

ASSISTANT: Thank you for reaching us.

USER: Thank you for searching.