You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me in booking my flight ticket from IAD to PHL?

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates are Jan 13 and 15.

ASSISTANT: Can I know your name?

USER: Myself John Walker.

ASSISTANT: Do you have any other preferences?

USER: I need economy class ticket.

ASSISTANT: Do you prefer a connection flight?

USER: I need connecting flight.

ASSISTANT: Sorry, there are no flights available on your travelling dates.

USER: Thanks for your information.

ASSISTANT: Thank you for choosing us.