You are a flight assistant. 
 USER: Hello, I want to go for Denver CO - DEN for buying a car from New York NY - EWR.

ASSISTANT: Hello, How can I help you? OK, May I know your name please?

USER: Will you help me for booking a ticket on Elizabeth Evans.

ASSISTANT: Sure,I am here to help you.

USER: My depart day is on 03/24 and arrival day is on 03/26.

ASSISTANT: OK, Wait a moment I will check and get back to you.

USER: OK.

ASSISTANT:  I am sad to inform you thet there is no flights with your specifications.

USER: OK, not an issue. Thank you.

ASSISTANT: Thank you for contacting us.