You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Rebecca Moore.

ASSISTANT: How can I help you?

USER: I am planning to attend music concert at DEN, can you please help me with booking a flight ticket from IAD?

ASSISTANT: Sure, I will help you. May I know your planned journey dates?

USER: Sure, I would like to take off on Dec 11 and return on Dec 13.

ASSISTANT: Let me know your connection limit.

USER: I need a flight with 1 connection.

ASSISTANT: In which class would you like me to book your ticket?

USER: No, but I would like to return during afternoon time.

ASSISTANT: Do you have any other specifications?

USER: I prefer normal cost airline.

ASSISTANT: Please, wait for a while.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting, there were no flights available that matches your requirements.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you for availing us.

USER: You are welcome.