You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you today?

USER: I want to change my reservation, can you help me with that?

ASSISTANT: Sure, can you please mention your name?

USER: Jason Davis here.

ASSISTANT: We found reservation with your given name, can you please share your location codes?

USER: My airport codes are from SFO to JFK.

ASSISTANT: Can you please share your travelling dates?

USER: My travelling dates are from Sept 13-15.

ASSISTANT: Do you have class preference?

USER: No.

ASSISTANT: Do you need connection limit?

USER: I prefer to fly in direct flight.

ASSISTANT: Sorry, no flight found in that route.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.