You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: I am Thomas Edwards. I want to book a ticket from DEN to EWR, can you help me?

ASSISTANT: Sure, may I know your planned travel dates to check for the flight availability?

USER: My travel dates are 08/24 and 08/26.

ASSISTANT: Do you have any specifications?

USER: I want to depart in the evening.

ASSISTANT: Sorry, there are no flights available for your desired dates.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for reaching us.