You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you today?

USER: I am Alexander Roberts, I want to book a flight on 01/17 and return on 01/19.

ASSISTANT: Sure.

USER: Can you book a connecting flight?

ASSISTANT: Please specify your airport codes.

USER: I will fly from TX-IAH and land on CO-DEN.

ASSISTANT: Thanks for your details. There is no flight found on your requested dates.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for visiting us.