You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How could I support you today?

USER:  I am Michelle Thompson. Can you please hold me a flight ticket from DEN to OAK?

ASSISTANT: Help me with your travelling dates?

USER: My trip dates are 04/28 - 04/30.

ASSISTANT: Please share me your specifications.

USER: I need a single connection.

ASSISTANT: Unfortunately there are no flights are running on your route according to your given information.

USER: No issues, thank you.

ASSISTANT: Thank you for opting us.