You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Helen Green here.

ASSISTANT: How can I help you?

USER: I would like to travel HOU for attending client meeting over there. Please, assist me to book a flight ticket from IAD.

ASSISTANT: Sure, I am here to help you. Can you please provide me your travel dates?

USER: My itinerary dates are 06/24 and 06/26.

ASSISTANT: Ok, please give me a minute to check the availability of flight.

USER: Ok, I want direct flight.

ASSISTANT: Sorry, there are no direct flight found with the details you have given.

USER: No problem, thank you so much.

ASSISTANT: You are welcome. Thank you for reaching us.