You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you now?

USER: I need to book a flight ticket from LAS to IAH, Can you please help me for booking?

ASSISTANT: Sure, I will help you with that. Can you please provide your preferable dates of travelling?

USER: I would like to travel on 11/21 to return on 11/23.

ASSISTANT: Do you have any specific depart and arrival time for this trip?

USER: No, I am comfortable with any timings.

ASSISTANT: Are you ok with connecting flight?

USER: No, I need a direct flight.

ASSISTANT: Any other preferences do you have?

USER: No.

ASSISTANT: May I know your name please?

USER: Stephanie Wilson here.

ASSISTANT: Please wait a moment to check the flights on your route.

USER: Sure.

ASSISTANT: I am sorry to inform you that, none of the airlines is providing a flight on your travel dates and locations to book a flight ticket.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for approaching us, have a great day.