You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Is this flight ticket booking agency.

ASSISTANT: Yes,How can I help you?

USER: I have to go San Francisco, because I want to meet my grandmother in this winter holidays, can you please check is there any flight ticket available from Seattle on 11/25?

ASSISTANT: Please provide your airport codes.

USER: I want to departure from SEA airport and destination airport is SFO.

ASSISTANT: Flight 1000 of Delta airlines is available for you. May I know your name?

USER: Please book my return ticket also on 11/27.

ASSISTANT: Sure.

USER: My name is Raymond Allen.

ASSISTANT: Allen, your ticket is booked.

USER: Thank you for your help.

ASSISTANT: Thank you.