You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you?

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

ASSISTANT: Yes, please I will help you with flight ticket booking.

USER: Thank you.

ASSISTANT: Ok, now please share your travel dates?

USER: Sure, I would like to take off on 05/10 and return on 05/12.

ASSISTANT: Thanks for waiting. But I am sorry to say that there are no flights available.

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

ASSISTANT: Thank you.

USER: You are welcome.