You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I guide you today?

USER: I want you to make my flight reservation from DEN to ORD, can you please help me?

ASSISTANT: Sure, can you please share your preferable journey dates?

USER: Sure, I will depart on Dec 26th and return back on Dec 28th.

ASSISTANT: May I know your name please?

USER: My name is Mary Mitchell.

ASSISTANT: Do you have any specifications?

USER: I only prefer for a single connection flight.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: I am sorry to say that there is no flight found under your details.

USER: Sad to hear that. Anyway, thank you.

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