You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Sandra Young.

ASSISTANT: How can I assist you today?

USER: I want to book a ticket from EWR to DEN to attend seminar, can you help me in booking?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: May I know your travel dates please?

USER: I am departing on 08/18 and return on 08/20.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for your patience, here there are no flights available for your desired intents which are provided to me.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for reaching us. Have a great day.