You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you today?

USER: I need to book a flight ticket from CLT to SEA, can you help me in booking a flight ticket?

ASSISTANT: Sure, we are mirthful to assist you in booking. Could you please share your planned travelling dates to proceed further?

USER: Sure, my journey dates are Dec 16 and Dec 18.

ASSISTANT: May I know your name please?

USER: Sure, Joseph Parker here.

ASSISTANT: Would you like to travel in a connecting flight or a direct flight?

USER: I prefer a direct flight.

ASSISTANT: Is there any other preferences that you would like to add before booking?

USER: No.

ASSISTANT: Please be on hold for sometime, as I can check a flight for your journey with the best airlines.

USER: Sure.

ASSISTANT: Thank you for waiting,  We are unable to provide flight in between your journey routes due to some technical up-gradation at destination airport.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for availing us.