You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Matthew Garcia.

ASSISTANT: How may I guide you today?

USER: I want to go for an adventure trip in San Francisco. Can you book me a flight ticket from Atlanta, GA - ATL to CA - SFO.

ASSISTANT: Sure, I will help you with that. Can you please share your preferable journey dates?

USER: I would start on 12/31 and return on 01/02.

ASSISTANT: Please give me a minute, I will check the flight availability.

USER: Ok.

ASSISTANT: I am sorry to say that there is no flight found under your details.

USER: It's Ok, thanks for your response.

ASSISTANT: Thank you for contacting us, have a great day.