You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Jonathan Brown.

ASSISTANT: How may I help you?

USER: I would like to meet my cousin at New York, will you help me in booking the flight ticket from DCA to LGA?

ASSISTANT: May I know your travel dates?

USER: My travelling dates are 05/13 and 05/15.

ASSISTANT: Sorry for this inconvenience, I could not find any flight with your requirements.

USER: Ok, not an issue.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.