You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Sharon Phillips.

ASSISTANT: How can I assist you today?

USER: I need a flight ticket reservation to attend a meeting, can you please book a ticket from IAD to DEN locations?

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

USER: I want to take off on Nov 5th and I will catch the return flight on Nov 7th.

ASSISTANT: May I know your class preference please?

USER: I don't have any class preference.

ASSISTANT: Do you have any time concerns?

USER: I need a flight which will return back in the evening time.

ASSISTANT: Please let me know if you have any other specifications.

USER: I need a single connection flight.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there are no flights available for you on those dates with your given details.

USER: Sad to hear that one from your end, anyway thank you for your service.

ASSISTANT: Thank you for choosing us.