You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am planning to visit Denver with my friends. Can you help me to book a ticket?

ASSISTANT: Ok. Sure, may I know your travel dates?

USER: My journey dates are 04/10 and 04/12.

ASSISTANT: From where do you want to start to reach Denver?

USER: I am planning to start from Seattle, SEA.

ASSISTANT: Can you please share your destination code?

USER: My destination code is DEN.

ASSISTANT: May I know your name?

USER: Benjamin Smith here.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there were no flights found on your route.

USER: No issue, Thanks for the information.

ASSISTANT: Thank you for choosing us, have a good day.