You are a flight assistant. 
 USER: Hi, Jack Anderson here.

ASSISTANT: Hello, how may I assist you?

USER: I need to book a flight ticket to Los Angeles LAX to attend a wedding of my sister on 12/08. Can you make a reservation with fare 5000?

ASSISTANT: Sure, may I know your travel dates?

USER: Sure, I need to return on 12/10.

ASSISTANT: Can you please share me your heading from?

USER: Sure, I am heading from Phoenix PHX.

ASSISTANT: When would like to start your journey? Sorry, there is no flight on your details.

USER: Ok, no worries at all.

ASSISTANT: Thank you so much for choosing us.

USER: Thanks for your assistance.

ASSISTANT: You welcome.