You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER:  My name is Charles Lee. I would like to book a ticket from IAH to BOS.

ASSISTANT:  Yes, I will definitely try my best to help you in booking your flight ticket. Could you please provide your planned dates of journey?

USER: My itinerary travel dates are Apr 30 and May 02.

ASSISTANT: Do you have any class preference?

USER: No I don't have any class preferences.

ASSISTANT: Do you have any other specifications on your trip?

USER: I would like to board on a single connection flight where the depart time should be in the evening.

ASSISTANT: Ok, please wait a moment.

USER: Sure, take your time.

ASSISTANT: Sorry to say, no flights found with your requirement.

USER: No problem , Thank you for the information.

ASSISTANT: Thanks for reaching us.