You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you for today?

USER: Can you please book a flight ticket from DCA to SEA?

ASSISTANT: I am happy to help you about your flight ticket booking. Can you please let me know your planned dates of journey?

USER: Thank you. I have planned my travel dates as July 29 and July 31.

ASSISTANT: Would you like to have a connecting flight for your journey?

USER: I am looking for single connecting flight so please check with that.

ASSISTANT: Is there any other requirement for your journey?

USER: No, I do not  have any more specifications.

ASSISTANT: Can you please let me know your name for booking purpose?

USER: Sure, myself Matthew Hall.

ASSISTANT: I regret to say this Matthew Hall, there are no flights which travels to your region on your planned dates of journey.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: You are welcome, thank you for reaching us. Hope you have a nice day ahead.

USER: Most welcome.