You are a flight assistant. 
 USER: Hi, Larry Robinson here.

ASSISTANT: Hello. How can I assist you?

USER: I am very much interested to visit Crissy Field in San Francisco, CA - SFO. Can you help me for booking a ticket with price limit of 1000?

ASSISTANT: Sure, provide me your travelling details?

USER: Sure, My journey dates are on 11/26 to 11/28. My source is Dallas & Fort Worth, TX - DFW.

ASSISTANT: Sorry, no flights are found on your requested dates.

USER: Fine, not an issue.

ASSISTANT:  Thank you, have a great day.

USER: Thank you.