You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jason Clark here.

ASSISTANT: How can I assist you?

USER: I would like to book a flight ticket from HOU to DFW. Can you please help me with booking?

ASSISTANT: Ok, may I know your travelling dates?

USER: My travelling dates are from 11/25 to 11/27.

ASSISTANT: Sorry, no flights found on your route to reserve your ticket.

USER: Not a problem, anyway, thank you for the information.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your help in searching.