You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: Can you please help me in reserving my flight from SFO to visit LGA?

ASSISTANT: Sure, I am here to help you with that. Can I know your planned trip dates?

USER: Thank you, I would like to start on Dec 11th and return on Dec 13th.

ASSISTANT: May I know your name?

USER: I am Rachel Lewis.

ASSISTANT: Ok, do you have any other requirements?

USER: I prefer a direct flight for my journey.

ASSISTANT: May I know your depart and return timings?

USER: I am comfortable at any provided timings.

ASSISTANT: Sorry to say that, there are no flights available based on your travelling dates.

USER: Ok, not an issue. Anyways, thank you for the help.

ASSISTANT: Thank you for approaching us.