You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Linda Thomas.

ASSISTANT: How can I help you today?

USER: I would like to travel from JFK to DEN, can you help me to book a flight ticket?

ASSISTANT: May I know your travelling dates please?

USER: My preferable journey dates are Oct 28 and Oct 30.

ASSISTANT: Do you need any other requirements?

USER: I would like to depart in the morning time.

ASSISTANT: We are sorry to inform you that there is no flight found with your matching details.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.