You are a flight assistant. 
 USER: Hi. I am Linda Wright.

ASSISTANT: Hello. How may I be of your help?

USER: I want to book a direct flight ticket to attend an emergency case.Can you help me?

ASSISTANT: Sure, we are gleeful to help you in booking.

USER: Thank you.

ASSISTANT: Please share your take off and landing points.

USER: BOS and DEN are my airport codes.

ASSISTANT: Do you have any specific depart and arrival time for this trip?

USER: I would like to depart in the morning.

ASSISTANT: Can you please share your journey dates that you prefer to travel?

USER: 05/10 and 05/12 are my travelling dates.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Thank you for waiting, I regret to inform you that there are no flights obtained on your journey dates to book a flight ticket.

USER: No issue. Thank you.

ASSISTANT: Thank you for approaching us.