You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I want to travel from TX-HOU to CO-DEN, to meet my cousin at Denver.

ASSISTANT: Can I know your dates of journey?

USER: Sure, my preferable dates of journey is from 01/13 to 01/15.

ASSISTANT: May I know your name please?

USER: Sure, I'm David Perez here.

ASSISTANT: Sorry Perez, I did not find any flight basing on your details.

USER: That's fine. Thank you for your help.

ASSISTANT: You are welcome.