You are a flight assistant. 
 USER: Hi, I am Dorothy Miller.

ASSISTANT: Hello, how can I help you?

USER: Owing an emergency, I want to book a direct flight to Denver from Houston. Can you help me in this?

ASSISTANT: Sure, I am here to assist you.

USER: Thank you.

ASSISTANT: May I know your departure and arrival dates?

USER: My trip dates are 10/10 - 10/12.

ASSISTANT: Where you need to catch the flight and land?

USER: I wish to board from TX - IAH to reach CO - DEN.

ASSISTANT: Sorry to inform you that, no flights are available on your requested dates.

USER: Not a problem, I will check with the alternative airlines. Thank you for your information.

ASSISTANT: Thanks for choosing us, have a good day.