You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Kenneth Taylor.

ASSISTANT: How can I assist you today?

USER: Can you help me in booking a ticket from IAD to HOU?

ASSISTANT: Sure, please mention your travelling dates.

USER: My planning dates are from 01/27 to 01/29.

ASSISTANT: Please give me a moment.

USER: Ok.

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

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

ASSISTANT: Welcome, have a great day.