You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I am planning to visit Dallas, will you help me in booking the flight ticket ATL to DFW?

ASSISTANT: Sure, please share me your trip dates.

USER: My preferable journey dates are Dec 15 and Dec 17.

ASSISTANT: Is there any class preferences for you?

USER: I am comfortable in any class.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I need a flight with single connection.

ASSISTANT: For booking, we need your good name. Please mention it.

USER: Myself Samantha Hall.

ASSISTANT: Is there any time concern for you?

USER: I would like to depart in morning time.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for opting us.