You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you help me to reserve a flight ticket from HOU to DFW?

ASSISTANT: Sure, can you please mention your travel dates?

USER: My travelling dates are 28 and 30 of July.

ASSISTANT: May I know your name?

USER: I am Joseph Baker.

ASSISTANT: Do you have any connection limit preference for this trip?

USER:  I am willing to travel in a single connecting flight.

ASSISTANT: Do you have any other preferences?

USER: No.

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

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you for choosing us.