You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello tell me how may I help you?

USER: My name is Richard Johnson, planning to travel from OAK to MSP. My travelling dates are from 11/10 to 11/12.

ASSISTANT: OK, wait a second.

USER: OK.

ASSISTANT: sorry to say, no flights found on your details.

USER: It's OK. Thank you.

ASSISTANT: Thank you.