You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you?

USER: Please make me a reservation on dates from 10/20 to 10/22 as I have a badminton competition in between these dates. Can you help me to book a ticket?

ASSISTANT: Sure. May I know your good name?

USER: Richard Moore here.

ASSISTANT: To proceed booking I need your airport codes.

USER: My airport codes are DFW-DEN.

ASSISTANT: Please, wait for a minute.

USER: Sure, Make it fast.

ASSISTANT: Thanks for waiting, there is no flights found on your given requirements.

USER: No issue, I will check with another airline.

ASSISTANT: Thank you for opting us.

USER: Thank you for kind service.