You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: Kathleen Rodriguez here. I would like to book a ticket from PHL to IAH, can you please help me with that?

ASSISTANT: Ok, may I know your travelling dates?

USER: The travel dates are from 04/14 to 04/16.

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

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

ASSISTANT: Thank you for reaching us.