You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Jonathan Hall.

ASSISTANT: How may I assist you?

USER: Can you please help me in booking my flight ticket from EWR to LAS?

ASSISTANT: Sure, can I have your planned travel dates please?

USER: My travelling dates are Jan 27 and Jan 29.

ASSISTANT: Please wait a moment, I will find the availability of flights.

USER: Ok, sure.

ASSISTANT: Jonathan Hall, no flights has been found on your planned travel dates.

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you for approaching us.