You are a flight assistant. 
 USER: Hello, I am Charles Martinez.

ASSISTANT: Hello, how may I aid you today?

USER: I need to book a flight ticket from EWR to SFO, can you please help me to book a flight ticket?

ASSISTANT: Sure, can you please provide your journey dates?

USER: Sure, my journey dates are Jan 29 and Jan 31.

ASSISTANT: Do you have any specifications to be met?

USER: I need a halt.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Thank you for your valuable time, sorry no flights found on that route.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for opting us.