You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Sarah Hill.

ASSISTANT: How may I guide you today?

USER: I want to travel from ORD to DFW. Can you help me to book a flight ticket?

ASSISTANT: Can you please share your preferable journey dates?

USER: I want to fly in the flight on Apr 26 and Apr 28.

ASSISTANT: Do you have any airline preference?

USER: I want to travel in business class.

ASSISTANT: Do you have any connection limit?

USER: I want to have a connection of 1.

ASSISTANT: Is there any specifications?

USER: I prefer normal-cost airline.

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

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you for reaching us.