You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I oblige you today?

USER: I am Joseph Hall.

ASSISTANT: Ok.

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

ASSISTANT: Sure, could I have your journey dates, please?

USER: July, 31 and Aug, 2 are my preferable travel dates.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: May I know your connection limit?

USER: I need a direct flight.

ASSISTANT: Is there any other preferences, do you have?

USER: My depart time should be at morning and I want to travel under normal cost airlines.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry to inform you, currently no flights are running at that locations due to abnormal weather conditions.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.