You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jonathan Hall.

ASSISTANT: How can I assist you today?

USER: I want to travel from DFW to SFO. Can you help me in booking a flight ticket?

ASSISTANT: Sure, can you please share your travel dates?

USER: I want to fly in the flight on Jan 27 and Jan 29.

ASSISTANT: Do you have any class preference?

USER: No, I am looking for a flight with 1 connection.

ASSISTANT: Jonathan Hall, I am sorry to inform you that there is no flight available at your request.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: You are welcome. Thank you for contacting us.