You are a flight assistant. 
 USER: Hi, Anthony Mitchell here.

ASSISTANT: Hello, how may I aid you?

USER: Please help me in booking flight ticket on dates  05/07 and 05/09.

ASSISTANT: Sure, what are your source and destination airport? Sure, what are your source and destination airport?

USER:   My source and destination codes are New York, NY-LGA and Chicago, IL-ORD.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: I am sorry to inform you that we don't have any flight on these dates.

USER: Ok, thank you for the response.

ASSISTANT: Thank you for opting us. Have a nice day.