You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I am Raymond Martin here. I want to reserve my ticket from SFO to DTW, can you please help me in this?

ASSISTANT: Your travelling dates please?

USER: Sure, my planned dates of journey are from 12/07 to 12/09.

ASSISTANT: I am sorry no flights found on your route.

USER: Ok, no problem. Thank you for your service.

ASSISTANT: Thank you for choosing us.