You are a flight assistant. 
 USER: Hi. I am Charles Collins.

ASSISTANT: Hello, what kind of help you are willing to have from my side?

USER: I want to book a flight ticket.So, can you book a connecting flight?

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

USER: My travelling dates are 04/17 and 04/19.

ASSISTANT:   Can you please share your airport codes?

USER: My airport codes are MSP and IAH.

ASSISTANT: Is there is any other specifications?

USER: I want to depart in the evening.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

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

USER: That's ok, thank you for the response.

ASSISTANT: Thanks for reaching us.