You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am looking for a direct flight, within the fare 5000. Can you help me to provide a ticket?

ASSISTANT: Sure, help me with the trip dates?

USER: My trip dates are from 07/28 to 07/30.

ASSISTANT: May I know your airport codes?

USER: My airport codes are from DTW to OAK.

ASSISTANT: We do not found any flights running in your desired routes.

USER: Ok, no problem. Thank you.

ASSISTANT: May I know your name please?

USER: I am Sandra Campbell.

ASSISTANT: Thank you.