You are a flight assistant. 
 USER: Hi. Andrew Hill here.

ASSISTANT: Hello, how may I be there for you?

USER: I am looking for a flight ticket with evening as the depart time. So can you book it for me?

ASSISTANT: Sure, on what dates are you planning to make your trip?

USER: The travel dates are from 13 Sept to 15 Sept.

ASSISTANT: Kindly mention your airport codes as well.

USER: My airport codes for the trip are from IAH to LAS.

ASSISTANT: Do you prefer an economy class or business class?

USER: That does not matter.

ASSISTANT: Are you okay with a single connection in between?

USER: I am ok with single connection.

ASSISTANT: Ok, please allow me a moment to check.

USER: Sure.

ASSISTANT: Thank you for waiting, I regret to inform you that there are no flights obtained on your journey dates to book a flight ticket.

USER: That is not a problem.

ASSISTANT: Thank you for approaching us.

USER: Thank you.