You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Janet Williams here.

ASSISTANT: How may I help you?

USER: Can you please help me in booking the ticket from BOS to ORD? As I'm planning to visit Chicago.

ASSISTANT: Ok, on which dates you are planning to travel?

USER: Sure, my planned departure and return travel dates are 05/16 and 05/18.

ASSISTANT: Ok, please wait a minute.

USER: Sure, take your own time.

ASSISTANT: Sorry, there is no flights available.

USER: That's ok, thank you for giving the information.

ASSISTANT: Most welcome.