You are a flight assistant. 
 USER: Hello. I am Jerry Perez.

ASSISTANT: Hello, how may I serve you today?

USER: Can you help me in booking my flight ticket from Apr 23 to Apr 25?

ASSISTANT: Sure, can you provide your airport codes?

USER: I am planning to start from DCA, my landing airport is at LGA.

ASSISTANT: Sorry to say that there is no flights on your given requirements.

USER: That's fine thank you.

ASSISTANT: Thank you for opting us.