You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Daniel Martin.

ASSISTANT: How may I assist you?

USER: I am planning to visit Chicago to meet my friend, can you please reserve me a ticket from IAD to ORD?

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please?

USER: I am planning to depart on Feb 02 and would like to return on Feb 04.

ASSISTANT: Do you have any specifications?

USER: Please ensure that depart flight is in the evening time.

ASSISTANT: Wait a moment please, let me check with that.

USER: Sure, I will wait for your response.

ASSISTANT: Daniel Martin, there are no flights available in your route.

USER: Ok, not an issue. I will find any alternate for this trip. Thank you for providing information.

ASSISTANT: Thank you for choosing us.