You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Jonathan Williams.

ASSISTANT: How may I lend a hand to?

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

ASSISTANT: Sure Williams, I am here to help you. When you are planning to travel?

USER: My travel dates are 01/19 and 01/21.

ASSISTANT: Just a moment.

USER: Sure.

ASSISTANT: There is a flight with Frontier airlines and the ticket figure is 900. Shall I proceed with this?

USER: My price limit is 500.

ASSISTANT: Williams sorry to intimate, no flights are available with your requirements.

USER: No problem, thanks for checking.

ASSISTANT: Thank you Williams for contacting us.