You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you today?

USER: I am Melissa Smith. I want to travel New York LGA from IAD, can you help me in booking flight ticket?

ASSISTANT: Sure, let me know your travel dates please?

USER: My travelling dates are Nov 9 and Nov 11.

ASSISTANT: Do you have any specific depart and arrival timings?

USER: I would like to return in the morning.

ASSISTANT: Do you need any other specifications?

USER: I need a stopover in between my journey.

ASSISTANT: Sorry to inform you that there are no flight services available on your given dates.

USER: Ok, not a problem. Thank you for your information.

ASSISTANT: Thanks for contacting us.