You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, do you need any help from us?

USER: I am Sarah Mitchell. Can you please help me in booking my flight ticket from IAH to LGA?

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: My travelling dates are June 24 and June 26.

ASSISTANT: Ok, may I know your departure and arrival time?

USER: My return ticket should be at evening time.

ASSISTANT: Ok, do you need direct or connected flight?

USER: I need connecting flight.

ASSISTANT: Ok, please allow me a moment.

USER: Ok, I will wait.

ASSISTANT: Sorry, there is no flight on your requested travelling dates.

USER: Thanks for your information.

ASSISTANT: You are welcome, have a great day.