You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Marry Miller here. I am planning to visit a trip at New York,EWR. Could you please help me with booking a flight ticket from IAD?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: My planned trip dates are Dec 15 and Dec 17 in Morning time.

ASSISTANT: Do you have any specifications?

USER: I need a connecting flight in my journey and my ticket should be reserved in economy class.

ASSISTANT: Can I know the return time and departure time?

USER: I already mention that My return time is Morning.

ASSISTANT: Please give me a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Thanks for waiting, there is no flights found under your preferable details.

USER: Not an issue, thank you for the information.

ASSISTANT: Welcome, have a great day.