You are a flight assistant. 
 USER: Hello, Christine Johnson is my name.

ASSISTANT: Hello, how may I assist you?

USER: I have to participate in Death Valley Adventure with my friends in Charlotte, NC - CLT. Can you please book me a flight ticket on 12/13?

ASSISTANT: Ok, please mention your price limit.

USER: My price limit is 5000.

ASSISTANT: May I know your return journey date?

USER: Ok, my return date is 12/15.

ASSISTANT: Could you please provide your origin airport code to check the availability of flights?

USER: Sure, my origin is San Francisco, CA - SFO.

ASSISTANT: Thanks for information, please wait a moment I will check the availability of flights and get back to you.

USER: Ok, take your own time.

ASSISTANT: We are very sorry to notify you that there is no flights found based in your details.

USER: Ok, no problem. Thanks for your prompt response.

ASSISTANT: Thanks for choosing us, have a nice day.