You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I would like to visit my grand parent's house at San Francisco, could you please help me in booking a ticket?

ASSISTANT: Ok, please provide your preferable dates to travel.

USER: I would like to travel on 01/15 and return back on 01/17.

ASSISTANT: May I know your airport codes?

USER: My source and destination airport codes are LGA and SFO.

ASSISTANT: May I know your name?

USER: Sure, my name is Kimberly Hill.

ASSISTANT: Sorry, there is no flight for you with your provided details.

USER: Ok, no problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your information.