You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I am Patrick Parker here, I want to reserve my ticket from PHL to SFO, can you please help me in this?

ASSISTANT: Ok, may I know your travelling dates?

USER: Sure, my preferable dates of journey is from 11/07 to 11/09. Please make sure that the price limit is 500.

ASSISTANT: Ok, please wait. Sorry, no flights found on your preferable dates.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your service.