You are a flight assistant. 
 USER: Hello, Samantha Wilson here.

ASSISTANT: Hello, how can I guide you?

USER: I have a live concert at Denver, please help me in booking a ticket from MCO to DEN.

ASSISTANT: Sure, may I know your planned journey dates?

USER: My journey dates are 05/15 and 05/17.

ASSISTANT: Please wait for a minute.

USER: Sure, take your time.

ASSISTANT: There are no flights available at this moment.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for contacting us.