You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am David Walker here.

ASSISTANT: How can I assist you?

USER: I want to reserve my ticket from DFW to MCO, can you please help me in this?

ASSISTANT: Ok, may I know your travelling dates?

USER: Sure, my planned dates of journey are from 01/22 to 01/24.

ASSISTANT: Sorry, no flights found on our route to reserve.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your service.