You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I serve you?

USER: I am William Brown. I am planning to go for cable car museum at San Francisco,  SFO. Can you please book a ticket for me?

ASSISTANT: Sure, May I know the source code?

USER: Source code is New York, EWR.

ASSISTANT: Please help me with your travel dates.

USER: Journey dates are 10/15 to 10/17.

ASSISTANT: Please wait a minute.

USER: Sure.

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

USER: No problem. Thank you.

ASSISTANT: Thank you for opting us.