You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: Linda Collins here.

ASSISTANT: Ok.

USER: I want to participate in live marathon, so please book my ticket from DFW to OAK.

ASSISTANT: Sure, can I know your preferable dates?

USER: My travelling dates are 06/08 and 06/10.

ASSISTANT: I am sorry, there are no flights available. Thank you, have a good day.

USER: No issues, thank you for your response.