You are a flight assistant. 
 USER: Hello. I am Alexander Adams.

ASSISTANT: Hello, how may I help you now?

USER: I have planned to attend a conference at Denver, CO - DEN. Can you please help me to book a ticket from SFO?

ASSISTANT: Sure, please share me your planned journey dates?

USER: My planned dates of journey are 01/30 and 02/01.

ASSISTANT: May I know your budget for flight ticket?

USER: I can pay 200 only.

ASSISTANT: Thank you details, sorry there is no flight available on your journey data.

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

ASSISTANT: Thank you for reaching us.