You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How shall I assist you?

USER: Can you help me book a flight ticket on the name of Frank Johnson within the price limit of 5000?

ASSISTANT: Please provide travelling schedule.

USER: I would like to start on 12/11 and return on 12/13.

ASSISTANT: May I get departure and return locations.

USER: My journey is from CLT to ATL.

ASSISTANT: I am sorry there is no flight available to be booked by name Frank Johnson.

USER: Ok, thank you for your response.

ASSISTANT: Thanks.