You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I serve you?

USER: I am Donna Brown. I am planning to go for comedy city tour at Charlotte, CLT. Can you please book a ticket on 03/27?

ASSISTANT: Sure, May I know the source code?

USER: Source code is San Francisco, SFO.

ASSISTANT: Please help me with your return date.

USER: I will return on 03/29.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: No problem. Thank you.

ASSISTANT: Thank you for opting us.