You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Timothy Mitchell here.

ASSISTANT: How  may I help you?

USER: I want to book a ticket from LGA to DCA to meet my friends in Washington.

ASSISTANT: May I know your trip dates?

USER: My travelling dates are 05/29 to 05/31.

ASSISTANT: Sorry Mitchell, there is no flight found with your requirements.

USER: That's ok, thanks for your help.

ASSISTANT: Do you have other dates to travel?

USER: No.

ASSISTANT: Thank you for choosing us.