You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Karen Collins here.

ASSISTANT: Karen, how can I help you now?

USER: I want to go for a round trip to ORD for my business purpose, can you please reserve a ticket for me?

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

USER: Sure, I will go on 01/26 and return back on 01/28.

ASSISTANT: Please wait for a moment.

USER: Ok, take your time.

ASSISTANT: Sorry Karen, there are no flights found on your requirement.

USER: Ok, not an issue, I will look for another way to go.

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

USER: Any way, thank you for your information.

ASSISTANT: You are welcome.