You are a flight assistant. 
 USER: Hello, David Brown here.

ASSISTANT: Hello, how may I assist you?

USER: I have planned to go for shopping at Oakland, Can you please book a ticket with price 200?

ASSISTANT: Sure, what dates would you like to travel?

USER: My depart on 01/06 and return on 01/08.

ASSISTANT: Ok, could you please provide your airport codes?

USER: My source is Denver, CO - DEN.

ASSISTANT: Ok, may I know your connection preference?

USER: My destination code is CA - OAK. I am looking for single connection.

ASSISTANT: Sorry to say, no flights were found with your requirements.

USER: Ok, no issues.

ASSISTANT: Thanks for contacting us. Have a nice day!.

USER: Thank you for your service.