You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Linda Martinez, can you help me to book a flight to PHL?

ASSISTANT: Sure, I will help you with that, please share your origin airport code?

USER: My origin airport code is LGA.

ASSISTANT: Can you help me with your travelling dates to proceed further?

USER: I am planning to take off flight on 12/25 and return on 12/27.

ASSISTANT: Sorry for the inconvenience, no flights as per your details.

USER: That is fine. Thank you for your help.

ASSISTANT: You are welcome.