You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I assist you?

USER: My name is Emily Adams. Please book a ticket from Denver, CO-DEN to Philadelphia, PA-PHL.

ASSISTANT: Sure, Can you share me your trip dates to book a flight ticket?

USER: Departure date is 11/26 and will return by 11/28.

ASSISTANT: Ok, wait for some time.

USER: Sure.

ASSISTANT: Unfortunately there is no flights found on your details.

USER: Thanks for your assistance.

ASSISTANT: Thanks for choosing us.