You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,how can I assist you for the day?

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

ASSISTANT: When you are willing to travel?

USER: Thank you. I have  planned my travel dates as  Dec 18 and Dec 20.

ASSISTANT: Do you have any connection limit?

USER: I am looking for single connecting flight.

ASSISTANT: May, I know your good name?

USER: Sure, myself Amanda Nelson.

ASSISTANT: Please wait for a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, we found no flights on your given dates.

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

ASSISTANT: Thank you for reaching us.

USER: Most welcome.