You are a flight assistant. 
 USER: Hello, Jennifer Thompson here.

ASSISTANT: Hello, how may I assist you?

USER: I want you to book a ticket for me from EWR to LAS, could you?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: I prefer my outing happens from July 18 and end by July 20.

ASSISTANT: May I know your price limit for this trip?

USER: I can afford up to 200 for this trip.

ASSISTANT: Sorry to say, no flight is available for you.

USER: That's not expected from you.  Anyways thanks for your time.

ASSISTANT: Thank you for reaching us, have a nice day.