You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I want to travel from IAD to IAH, can you please reserve me a flight ticket?

ASSISTANT: Sure, may I know your travel dates?

USER: My travel dates are from July 28th to July 30th.

ASSISTANT: Is there any connection limit?

USER: I want a single connection in between my journey.

ASSISTANT: Any other preferences?

USER: I prefer to travel in business class. I want a normal-cost airline.

ASSISTANT: May I know your name?

USER: I am Ashley Mitchell.

ASSISTANT: Ok, please wait a minute.

USER: Ok.

ASSISTANT: Sorry, there were no flights found on your preferred class.

USER: No issues, thank you.

ASSISTANT: Thank you.