You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I best serve you today?

USER: Please help me in booking flight ticket from PHL to IAD.

ASSISTANT: When would you like me to book a ticket?

USER: My trip dates are Nov 10 to Nov 12.

ASSISTANT: Ok, which type of class do you prefer for your journey?

USER: I am okay with any class.

ASSISTANT: Is there any connection limit for you?

USER: I prefer to travel in connecting flight.

ASSISTANT: Can I know your name?

USER: Cynthia Walker here.

ASSISTANT: Any other specifications do you have?

USER: No.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry Cynthia Walker, based on your required specifications we haven't found any flight in airline database.

USER: Ok, no problem. Thank you.

ASSISTANT: Thanks for reaching us.