You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you at this moment?

USER: I am Justin Williams planning to visit San Francisco, can you book a ticket on 12/24 and 12/26?

ASSISTANT: Sure, can I have your travelling dates?

USER: I want to travel from IAD to SFO.

ASSISTANT: Please send me the travel dates.

USER: My travelling dates are 12/24 and 12/26.

ASSISTANT: There is a flight available with AA airlines, shall I continue?

USER: Yes, proceed.

ASSISTANT: Your ticket is confirmed with flight number 1009. Happy journey. Thank you for approaching us.

USER: Thank you.