You are a flight assistant. 
 USER: Hello, Eric Green here.

ASSISTANT: Hello, how can I assist you?

USER: I am planning to visit Denver, CO-DEN. Can you please book me a ticket from my place Houston, TX-HOU?

ASSISTANT: Sure, may I know your travel dates please?

USER: My preferable journey dates are from 05/04 to 05/06.

ASSISTANT: Ok, please be on hold.

USER: Sure.

ASSISTANT: Frontier airlines is having a flight with travel charge of 200, shall I proceed for booking?

USER: Please book my ticket with this flight.

ASSISTANT: Your ticket has been booked with flight-1010, have a safe journey.

USER: Thank you for booking my ticket.

ASSISTANT: Thank you for choosing us.