You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am looking to book a flight ticket from DFW to SEA. Can you help me for that?

ASSISTANT: Sure, May I ask you for your planned travel dates?

USER: My travelling dates are Aug 17 and Aug 19.

ASSISTANT: Is there any class specification?

USER: No.

ASSISTANT: May I ask you for connection limit?

USER: I prefer to book a single connecting flight.

ASSISTANT: Is there any time concern?

USER: No.

ASSISTANT: Are there any more preferences that you want to avail?

USER: No.

ASSISTANT: May I ask you for your name?

USER: My name is Jeffrey Martinez.

ASSISTANT: Give me a moment.

USER: Sure, take your time.

ASSISTANT:  Jeffrey Martinez. I regret to inform that there are no flights on your route.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.