You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Andrew Thomas.

ASSISTANT: Nice to meet you Andrew.

USER: Can you help me in booking a ticket from SFO to DTW?

ASSISTANT: Sure, can you help me with the travelling dates?

USER: My planning dates are from 12/05 to 12/07.

ASSISTANT: Give me a minute.

USER: Sure.

ASSISTANT: Sorry, there is no flight on your requested dates.

USER: That's fine. Anyway, thank you for your help.

ASSISTANT: Thank you for opting us.