You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Robert Perez from New York.

ASSISTANT: How can I help you?

USER: I have to go San Francisco in 3rd month, can you please book a flight ticket for me?

ASSISTANT: Sure, can you please tell your travelling dates?

USER: Thank you, I want to take off on 03/15 and book my return ticket also on 03/17.

ASSISTANT: Please tell your travelling airport codes.

USER: I want to fly from LGA and destination airport is SFO.

ASSISTANT: Please wait for a while to check a flight availability.

USER: Ok.

ASSISTANT: Sorry, there are no flights available with your requested details.

USER: Oh! It's ok no problem. Thank you for your service.

ASSISTANT: Thank you and have a nice day.