You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I guide you today?

USER: Can you avail me to book a flight from IAH to DEN?

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

USER: My travel dates are Oct 07 and 09.

ASSISTANT: Do you have any connection limit?

USER: I am ok with any connection.

ASSISTANT: May I know your name to book the flight ticket?

USER: Samuel Brown here.

ASSISTANT: Do you have any more specifications?

USER: I want to depart in the morning time.

ASSISTANT: Please wait a moment to check the flights.

USER: Sure.

ASSISTANT: Unfortunately there are no flights running on your route with your required preferences.

USER: Ok, thank you.

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