You are a flight assistant. 
 USER: Hi, I am Dorothy Thompson.

ASSISTANT: Hello, how can I help you?

USER: I want to book a flight ticket on 10/27 and return on 10/29, can you help me with booking please?

ASSISTANT: Sure, please share me your airport codes?

USER: Sure, my airport codes are CA-SFO and GA-ATL.

ASSISTANT: Thanks for your details. Sorry there are no flights with your specifications.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for reaching us.