You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Ashley White.

ASSISTANT: Ashley White, how can I assist you for the day?

USER: I would like to book a ticket from PHX to SFO, can you help me?

ASSISTANT: Sure, I will help you with that. Could you please provide me your planned travel dates?

USER: My travel dates are 12/21 and 12/23.

ASSISTANT: I am very sorry to say, There are no flights found as per your travel dates.

USER: No problem, thanks for checking.

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