You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Betty Johnson. Can you please book me a ticket from LGA to SFO to meet my family?

ASSISTANT: Sure, we are here to assist you.

USER: Thank you.

ASSISTANT: May I know your trip dates?

USER: My travel dates are from 03/08 to 03/10.

ASSISTANT: Kindly specify your price limit?

USER: I can afford up to 500.

ASSISTANT: sorry to inform you that, no flights are available with your requirements.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.