You are a flight assistant. 
 USER: Hello. I am Samuel Carter.

ASSISTANT: Hello. How can I assist you?

USER: I planned to attend for attend for a wedding in DFW, can you please help me to book a flight ticket from IAH?

ASSISTANT: Ok, may I know your travelling dates?

USER: I prefer to travel on 11/19 and 11/21.

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

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.