You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Sharon Green.

ASSISTANT: How may I aid you?

USER: I am looking for a flight from New York-LGA to Minneapolis-MSP. Can you please help me to book the ticket?

ASSISTANT: Sure, tell me your travel dates please?

USER: The planned travel dates are Feb 07 and Feb 09.

ASSISTANT: Ok, please wait for a moment. Thanks for waiting. But I am sorry to say that there are no flights available.

USER: It's ok, not a problem. Thank you for your help.

ASSISTANT: Thank you.