You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: Andrew Phillips here. I would like to fly from DFW, would you please aid me in booking a flight ticket to ORD?

ASSISTANT: Sure, I will help you with that. Can you please share your preferable journey dates?

USER: My travelling dates are 11/16 and 11/18.

ASSISTANT: Do you have any class preference?

USER: I am comfortable with any class.

ASSISTANT: Please wait for a minute.

USER: Sure, take your own time.

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

USER: No issues, thank you for your service.

ASSISTANT: Thank you for reaching us.