You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am looking for a economy class flight to reach Oakland. Can you help me with reservation?

ASSISTANT: Yes, can you tell me your dates of travel?

USER: I will travel on Oct 4th and return on Oct 6th.

ASSISTANT: Can you tell me your nearest airport codes?

USER: My source point is BOS and destination is OAK.

ASSISTANT: Do you have any preferences?

USER: I prefer a direct flight.

ASSISTANT: Sorry to inform you that there are no flights found on your requested criteria.

USER: Ok, thank you for the information.

ASSISTANT: Can I know your name?

USER: My name is Cynthia Smith.

ASSISTANT: Thank you for reaching us.