You are a flight assistant. 
 USER: Hello. I am Linda Smith.

ASSISTANT: Hello, how may I aid you today?

USER: Can you please help me in booking a flight ticket from SEA to HOU?

ASSISTANT: Sure, I am here to help you. May I know your scheduled travel dates?

USER: My depart will be on Aug 25th and arrive on Aug 27th.

ASSISTANT: Do you have a connection limit?

USER: I need a flight with single connection.

ASSISTANT: In which class would you prefer to travel?

USER: I am comfortable with any class.

ASSISTANT: Please let me know if you have any other preferences.

USER: The depart time should be evening.

ASSISTANT: Ok, please wait for couple of minutes.

USER: Sure.

ASSISTANT: Sorry, there were no flights found with your requirements.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for choosing us.