You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am David Thomas here.

ASSISTANT: How can I help you now?

USER: I would like to reserve my ticket from ORD to MSP. Can you please help me out in booking a flight ticket?

ASSISTANT: Sure, I am here to help you with that. May I know your travel dates please?

USER: My planned travel dates are Oct 18 and Oct 20.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need a single connecting flight in my journey.

ASSISTANT: Let me know about your class preference.

USER: I am comfortable with any class.

ASSISTANT: Do you have any airline preference?

USER: No, I am ok with any airlines.

ASSISTANT: Provide me your depart and arrival timings.

USER: Yes, my arrival time should be in the afternoon.

ASSISTANT: Ok, please wait for  a while.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry to say that, there are no flights available as per our records.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your service.