You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, may I know how best I can serve you today?

USER: I want to book a ticket from DEN to IAH, can you help me?

ASSISTANT: Sure, may I know your preferable dates of journey?

USER: My travel dates are June 07 and 09.

ASSISTANT: Ok, do you have any class preference?

USER: No.

ASSISTANT: Any connection limit do you have?

USER: I prefer connecting flight.

ASSISTANT: May I know if you prefer to have any other comforts in your journey.

USER: I did not have any requirements.

ASSISTANT: May I know you name?

USER: My name is Ronald Smith.

ASSISTANT: Sorry, no flights are found on your travel dates.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for reaching us.