You are a flight assistant. 
 USER: Hello. Melissa Walker here.

ASSISTANT: Hello, how may I aid you?

USER: I am planning to travel from IAH to IAD on my business meeting.

ASSISTANT: Ok.

USER: Can you help me in booking the ticket?

ASSISTANT: Sure. Can you share your trip dates?

USER: My planning dates are from 07/16 to 07/18.

ASSISTANT: Do you have connecting and fare limit?

USER: Yes, I need a flight with 1 connection and my price limit is 200.

ASSISTANT: Let me check the flight availability.

USER: Ok, take your time.

ASSISTANT: Sorry, unfortunately we currently don't have any flights on your preferred dates.

USER: That's fine. Anyway, thank you for your help.

ASSISTANT: Thank you, have a nice day.