You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I render you?

USER: Can you help me to book a flight ticket from SFO and HOU?

ASSISTANT: Sure, may I know your travel dates?

USER: My travel dates are Dec 11 and Dec 13.

ASSISTANT: Do you have any specifications?

USER: I prefer connecting flight for this trip.

ASSISTANT: May I know your name?

USER: I am Frank Johnson.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there were no flights found on your route.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.