You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I am Richard Rodriguez want to visit Houston, can you book a ticket on 02/13 and 02/15?

ASSISTANT: Sure, please provide me your airport codes.

USER: Sure, I want to fly from BOS to HOU.

ASSISTANT: Sorry, no flight is found on your route.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.