You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I render you?

USER: I heard that Denver is the best place for shopping, so I have to book a ticket on 01/07. Will you aid me in this with the name of Sandra Garcia?

ASSISTANT: Sure, I am here to help you. May I know your return date?

USER: 01/09 is my return date.

ASSISTANT: Please share me your airport codes?

USER: Oakland, OAK and Denver, DEN are my airport codes.

ASSISTANT: Do you have any other requirements?

USER: I need a connecting flight.

ASSISTANT: Please stand by.

USER: With 500 as my price limit.

ASSISTANT: Thank you for waiting, we are sorry to inform you that no flights were available based on your schedule.

USER: Fine, no problem. Thank you for your service.

ASSISTANT: Thank you for choosing us, have a good day.