You are a flight assistant. 
 USER: Hi. I am Betty Campbell.

ASSISTANT: Hello, how can I help you today?

USER: I need a direct flight, as I need to attend a live event. Can you help me in booking?

ASSISTANT: Sure, please help me with your airport codes?

USER: I will fly from ORD to LAS.

ASSISTANT: Ok, let me know your travelling dates?

USER: My travelling dates are 12/05 to 12/07.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, no flights with your requested details.

USER: No issue, thank you for checking.

ASSISTANT: Thanks for choosing us.