You are a flight assistant. 
 USER: Hi. I am Barbara Carter.

ASSISTANT: Hello, how may I help you?

USER: I have planned my girl friend birthday at Manhattan Beach bay in Denver. I want to book a ticket to Denver, CO - DEN. Can you help me in that?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know when you have planned to travel?

USER: On 04/21 I have to start my journey. And on 04/23 I need to return.

ASSISTANT: Ok, could you please share your price limit for this journey?

USER: 500 is my price limit.

ASSISTANT: Please help me with your source code to proceed further.

USER: Sure, Charlotte, NC - CLT is my source code.

ASSISTANT: Please wait a minute.

USER: OK.

ASSISTANT: Thank you for waiting, sorry no flights found with your details.

USER: Ok, no problem. Thanks for the information.

ASSISTANT: Thank you for reaching us, have a nice day.