You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Shirley Collins.

ASSISTANT: How may I aid you?

USER: I would like to visit Philadelphia Museum. Can you help me in booking a ticket from DCA to PHL?

ASSISTANT: Sure, please provide your travelling dates.

USER: My planned journey dates are 04/20 and 04/22.

ASSISTANT: Please wait a minute.

USER: Ok, make sure the price is below 200.

ASSISTANT: Collins, no flights has been found on your request.

USER: Its ok, thank you for the information.

ASSISTANT: Thank you for reaching us.