You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, May I know what kind of service you are looking for?

USER: Myself Linda Gonzalez. Please book me a flight ticket from OAK to DEN.

ASSISTANT: Sure, I am euphoric to help you with booking.

USER: Thank you.

ASSISTANT: May I know on what dates would you like to travel?

USER: My trip dates are Jan 16 to Jan 18.

ASSISTANT: Do you like to go with a economy class or business class?

USER: I am comfortable with any class.

ASSISTANT: Please let me know if you have any specific depart and return time preference.

USER: My depart time should be in the evening.

ASSISTANT: Do you need any specifications in connection?

USER: I need a flight with single connection.

ASSISTANT: We are sorry to say that, there is no flight found on your requested details.

USER: Ok, no problem. I will choose alternate way to reach my destination. Thank you.

ASSISTANT: Thanks for choosing with us.