You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Mark Martinez.

ASSISTANT: How can I help you at this moment?

USER: I am planning to attend my cousin weeding in Washington, can you please reserve a flight ticket from HOU to IAD?

ASSISTANT: Sure, I will help you with that. Can you please mention your preferable travel dates?

USER: My trip dates are Feb 1 to Feb 3.

ASSISTANT: Are you okay with connecting flight or you need any direct flight?

USER: I need a connecting flight.

ASSISTANT: Do you have any preferences regarding timings of your journey?

USER: I prefer a flight which return in morning.

ASSISTANT: Do you have any another specifications?

USER: No.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

USER: No issue, thank you.

ASSISTANT: Thank you for reaching us.