You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am Frank Martin. Please book me a ticket from DEN to HOU to meet my family.

ASSISTANT: Sure, may I know your planned travel dates?

USER: I have planed to travel on Aug 11th and return on Aug 13th.

ASSISTANT: Do you have any specifications?

USER: I would like to depart and return at afternoon time.

ASSISTANT: May I know about the connection limit?

USER: I prefer connecting flight.

ASSISTANT: Here, there are no flights available for your desired intent.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.