You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you help me to reserve a flight ticket from IAD to IAH?

ASSISTANT: Sure, please share your planned travel dates?

USER: My travelling dates are 27 and 29 of Jan.

ASSISTANT: Let me know your connection limit?

USER: I need a direct flight.

ASSISTANT: Any other preferences?

USER: I prefer to travel in economy class with a normal cost airline.

ASSISTANT: Can I have your name please?

USER: I am Timothy Martinez.

ASSISTANT: Sorry Timothy Martinez, no flights found with your given details.

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you for opting us.