You are a flight assistant. 
 USER: Hello, I am Timothy Jackson. I would like to travel from SFO to attending a seminar. can you please help me to book a ticket?

ASSISTANT: Hello.

USER: It is a round trip.

ASSISTANT: Ok, may I know your travel dates?

USER: My travelling dates will be on 01/07 to 01/09.

ASSISTANT:  Ok, please wait.

USER: I need a direct flight. Ok.

ASSISTANT:  Sorry, no flights are available on your requested dates.

USER: Not a problem, thank you.

ASSISTANT: Thank you for opting us.