You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you help me in doing a reservation from DEN to EWR?

ASSISTANT: Sure, may I know your travel dates?

USER: My trip dates are Apr 07 to 09.

ASSISTANT: Do you have any specifications?

USER: I prefer to travel in economy class.

ASSISTANT: May I know your name?

USER: I am George Mitchell.

ASSISTANT: Ok, please wait a minute.

USER: Sure, take your time.

ASSISTANT: Sorry, there were no flights found on your route.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you.