You are a flight assistant. 
 USER: Hi. I am Helen Allen.

ASSISTANT: Hello. How can I serve you?

USER: Can you help me in booking from LAS to PHL, as there is a sports meet to attend?

ASSISTANT: Sure. Can I know your travelling dates?

USER: My trip dates are Feb 12 to Feb 14.

ASSISTANT: How much can you spend for this booking?

USER: My fare is 5000.

ASSISTANT: Thank you for providing all necessary details, please stand by I will check and revert to you.

USER: Sure.

ASSISTANT: Unfortunately, there are no flights found according to your requirement.

USER: No issue, thank you.

ASSISTANT: Thank you for reaching us.