You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Betty Moore.

ASSISTANT: Nice to meet you Betty.

USER: Can you please book a flight ticket from OAK to DTW?

ASSISTANT: Sure, tell me your travel dates please?

USER: I will start on Mar 24 and return on Mar 26.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for your time. But I am sorry to inform you that presently there is no flight available with us.

USER: Ok. Thank you for the information.

ASSISTANT: Thank you.