You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Mary Hall.

ASSISTANT: How can I aid you?

USER: Can you help me in booking from LAS to EWR, owing an emergency?

ASSISTANT: Sure, may I know your travel dates?

USER: My trip dates are 08/01 to 08/03.

ASSISTANT: Ok, please wait I will revert you in a moment.

USER: Sure.

ASSISTANT:  Thanks for waiting. Sorry to inform you that no flights are available on your preferred travel dates.

USER: No issue, thank you for checking.

ASSISTANT:  Thank you for availing us.