You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I have planned to book a plane ticket from IAD to HOU, can you assist me?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: My preferred dates are Jan 29th and Jan 31st.

ASSISTANT: Do you have any preferences about flight connections?

USER: I need single connection between my trip.

ASSISTANT: Do you have any preferences about class?

USER: No. you can proceed booking.

ASSISTANT: Please mention your name.

USER: Elizabeth White.

ASSISTANT: There is no flights found under your preferable details.

USER: No problem, thank you.

ASSISTANT: Welcome, have a great day.