You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I need to travel from PHL to DCA, can you help me in doing that?

ASSISTANT: Sure, let me know your trip dates please?

USER: My trip dates are Dec 06 to 08.

ASSISTANT: Ok, is there any class preference?

USER: No.

ASSISTANT: Do you have any time concern?

USER: No.

ASSISTANT: Do you need any airline preference?

USER: I am comfortable with any airline.

ASSISTANT: Can I know your name please?

USER: I am Larry Gonzalez.

ASSISTANT: Sorry to inform you that there are no flight services available on your given details.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thanks for contacting us.