You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you now?

USER: I would like to book my ticket from IAD to DCA. Can you please help me with booking?

ASSISTANT: Sure, I will help you with that. Can you please provide your preferable travelling dates?

USER: My preferable travel dates are Dec 06 and Dec 08.

ASSISTANT: May I know your connection limit?

USER: I need a flight with connection limit-1.

ASSISTANT: On whose name I have to reserve the flight ticket?

USER: You can reserve my ticket in the name of Edward Moore.

ASSISTANT: Any class preference do you have?

USER: Yes, I always prefer business class.

ASSISTANT: Is there any other requirements do you have?

USER: No, I din't have any other requirements.

ASSISTANT: Please be on hold to check the flights.

USER: Sure, I will wait for your response.

ASSISTANT: Unfortunately there are no flights running on your route with your required preferences.

USER: It's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for reaching us, have a great day.

USER: Thank you for your service.

ASSISTANT: Welcome.