You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how best I can assist you at this moment?

USER: Myself Kimberly Young. I have to attend my Grandson's wedding. Please help me by booking a flight ticket from DEN to IAD.

ASSISTANT: Sure, can you please let me know your journey dates?

USER: June 19 and 21 are my planned travel dates.

ASSISTANT: Do you prefer any class in your journey?

USER: I am comfortable with any class.

ASSISTANT: Please let me know your connection limit.

USER: I need a break in my journey.

ASSISTANT: Is there any more preferences do you need?

USER: I prefer to depart in the morning.

ASSISTANT: Ok, please be on hold.

USER: Sure, I will be here.

ASSISTANT: Sorry to inform you that, there are no flights found matching your details.

USER: No problem, I will check with another service provider. Thank you.

ASSISTANT: Thank you for choosing us.