You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Helen Harris, want to travel from OAK to MSP. Please help me in booking my ticket.

ASSISTANT: Sure, I am glad to help you in that. May I know your travel dates to proceed further?

USER: Thanks and my travelling dates are from 01/12 to 01/14.

ASSISTANT: Ok, please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no flight in this route as per your travelling details.

USER: It's ok, thank you for your help.

ASSISTANT: Thank you for reaching us.