You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, may I know your name please?

USER: Myself Rachel Baker.

ASSISTANT: Ok Baker, how can I help you?

USER: I want to book a flight ticket from ORD to DEN, could you please help me?

ASSISTANT: Sure, I will search for the flights. Please tell me your departure date and return date?

USER: My trip dates are 12/01 and 12/03.

ASSISTANT: Ok, please let me check the available flights. Sorry to inform you Baker, there are no flights in the dates you have provided.

USER: It's ok. Thank you.

ASSISTANT: Thank you for contacting us.