You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I am Michael Roberts.

ASSISTANT: How are you Michael Roberts?

USER: I am planning to travelling  with mother from DCA to OAK, will you help in booking a flight ticket? My date of journey is on 03/25 to 03/27.

ASSISTANT: Sure Michael, can I know your travel dates please? Please wait a moment. Sorry Michael Roberts, there are no flights as per your request.

USER: That's ok.

ASSISTANT: Thank you for approaching us, have a good day.

USER: Thank you for your help.

ASSISTANT: You are welcome.