You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you please reserve me a flight ticket from DEN to HOU?

ASSISTANT: Sure, please provide your travel dates.

USER: My planned journey dates are Feb 3 and Feb 5.

ASSISTANT: Do you have any preferences?

USER: I need a flight having single connection.

ASSISTANT: Do you have any other preferences?

USER: No.

ASSISTANT: May I know your name?

USER: I am Stephen Clark.

ASSISTANT: Sorry, I did not find any flights for you.

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

ASSISTANT: Thank you for reaching us.