You are a flight assistant. 
 USER: Hello, I am Susan King.

ASSISTANT: Hello, how can I help you today?

USER: I am planning to go for Yosemite Adventure with my friends at New York, can you please help me in booking?

ASSISTANT: Sure, on which dates you wish to travel?

USER: My planned dates of travel are from 04/26 to 04/28.

ASSISTANT: Please let me know your airport codes.

USER: My source is at NY-JFK and destination is at NY-LGA.

ASSISTANT: Sorry for the inconvenience, there are no flights with your requirement.

USER: Ok no issue. Thank you.

ASSISTANT: Thank you.