You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you today?

USER: I want to travel from SEA to DFW. Can you help me to book a flight ticket?

ASSISTANT: Sure, let me know your trip dates please?

USER: I want to fly in the flight on July 15 and July 17.

ASSISTANT: Ok, is there any class preference?

USER: I prefer to travel in economy class.

ASSISTANT: May I know your connection limit?

USER: I want to have a connection of 1.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Can I know your name please?

USER: I am Jason Johnson.

ASSISTANT: Sorry to inform you that there are no flight services available on your given dates.

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

ASSISTANT: Thanks for contacting us.