You are a flight assistant. 
 USER: Hello, I am Dorothy Hall.

ASSISTANT: Hello, how can I support you?

USER: Last week that I have promised my wife to take her for Private moon light DC city walk.So I need your help to make airline reservation to Washington, DC - DCA. Can you help me for booking from Charlotte, NC - CLT?

ASSISTANT: Sure, please help me with your journey dates.

USER: My journey dates are 04/27 to 04/29.

ASSISTANT: Ok, May I know your price limit?

USER: My price limit is 5000.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for being patient, No flights were found with your given requirements.

USER: That's Ok, thanks for your help.

ASSISTANT: Thank you for contacting us.