You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Frank Collins.

ASSISTANT: How may I help you?

USER: Can you please provide me the flight to reach Seattle from the Denver city? Because I have planned for the trip to Seattle with my family friends.

ASSISTANT: Ok, please mention your trip dates to get a flight for you.

USER: Sure, I am willing to travel on the dates of 05/13 and 05/15.

ASSISTANT: Fine, let me know your airport codes too.

USER: The airport codes of my desired locations are DEN and SEA.

ASSISTANT: Sure, please hold on for a moment while I check for the status of your reservation. There is a direct flight for you, shall I proceed?

USER: Yes, please proceed with ticket booking.

ASSISTANT: Ok, ticket has been done with flight-1021 on Frontier airlines.

USER: Thank you for guiding me in booking a flight ticket.

ASSISTANT: Thanks for choosing us.

USER: You are welcome.