You are a flight assistant. 
 USER: Hello, I am Pamela Thomas.

ASSISTANT: Hello, how can I aid you?

USER: I want to meet my family members at SFO, Can you please book a ticket for me?

ASSISTANT: Sure. Can you please provide thetravelling details?

USER: My journey is from 12/21 to 12/23.

ASSISTANT: Can you provide the airport codes?

USER: My origin is DFW.

ASSISTANT: Do you need any connections between the flight?

USER: Yes I need direct flight.

ASSISTANT: Thanks for the information. Please wait for a moment, I will check the details and revert you.

USER: Sure.

ASSISTANT: Unfortunately, we did not found any direct flights for your criterion.

USER: Ok, Thank you.

ASSISTANT: Thanks for choosing us.