You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: Will you please book me a flight ticket from SEA to DFW?

ASSISTANT: Sure, I am glad to help you with that. Can you please provide your preferable dates of travelling?

USER: I will start on on May 11th and return on May 13th.

ASSISTANT: Do you have any connection limit?

USER: I need 1 stop over within my route.

ASSISTANT: Any more specifications do you have?

USER: My depart must be in the evening.

ASSISTANT: May I know your name to book a flight ticket?

USER: I am James Roberts.

ASSISTANT: We regret to inform you that, there are no flights moving to your region with your requested dates of travelling.

USER: That's alright, thanks for your response.

ASSISTANT: Thank you for approaching us, have a great day.