You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Christopher Smith.

ASSISTANT: How may I assist you?

USER: I want to travel from HOU to PHX. Can you book a flight ticket for me?

ASSISTANT: Ok, may I know your journey dates?

USER: I want to travel in the flight on 10/22 and 10/24.

ASSISTANT: Sorry to inform you, there is no flight found on your route.

USER: That's ok. Anyways, thank you.

ASSISTANT: Thanks for choosing us, have a nice day.