You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Michelle Martinez.

ASSISTANT: How may I assist you today?

USER: I am planning to attend music concert at ORD, can you please help me with booking a flight ticket from SFO?

ASSISTANT: Sure, I will help you with that. Can you please share your preferable journey dates?

USER: Sure, I would like to take off on Dec 14 and return on Dec 16.

ASSISTANT: Do you have any class preference?.

USER: Make sure that the connection limit is 1.

ASSISTANT: I am sorry to say that there is no flight found under your details.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: You are welcome.