You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Edward Martin. I am planning to go for science exhibition at Minneapolis, MSP. Can you please book a direct flight for me?

ASSISTANT: Sure, please share me your travelling dates?

USER: Journey dates are 03/27 to 03/29.

ASSISTANT: Kindly assign me your source code?

USER: Origin code is Chicago, ORD.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there were no flights with your specifications.

USER: No problem. Thank you.

ASSISTANT: Thank you for reaching us.