You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am Amy Evans.

ASSISTANT: Nice to meet you Amy.

USER: I want to book a flight ticket from CA-SFO to MI-DTW. Can you help me?

ASSISTANT: Sure, I will help you with the flight ticket reservation.

USER: Thank you.

ASSISTANT: May I know your travel dates please?

USER: 03/25 and 05/27 are my travelling dates.

ASSISTANT: Please wait for a moment.

USER: I would like to return on 03/27. Ok.

ASSISTANT: Thanks for waiting. But I am sorry to say that there are no flights available.

USER: No issue. Thank you.

ASSISTANT: Thank you.