You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: William Collins here.

ASSISTANT: How can I aid you?

USER: I would like to meet my grand parents in San Francisco, so can you please help me out with booking of a flight ticket to go there?

ASSISTANT: Sure Collins, can I know the travel dates please?

USER: My boarding is on 08/17 and please book a return ticket on 08/19.

ASSISTANT: Could you provide the airport codes please?

USER: Sure, I want to travel from BOS to SFO.

ASSISTANT: Ok, wait a moment please.

USER: Sure, take your time.

ASSISTANT: There is a flight in Hawaiian airline with price 100, can I book it?

USER: It is perfectly matches with my requirements, you can proceed with booking.

ASSISTANT: Your ticket has been booked with flight number 1023.

USER: Thank you for your assistance.

ASSISTANT: Thank you for approaching us.

USER: Welcome.