You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I will be booking a flight to Houston, can you help me with my reservation?

ASSISTANT: Sure, could you please help me with your dates of trip?

USER: My travelling dates for this trip will be from 10/27 to 10/29.

ASSISTANT: Ok, can you please specify your source and destination airports codes for booking a ticket?

USER: My origin airport code is MSP and destination airport code is IAH.

ASSISTANT: Please wait for a moment to check for the availability of a flight.

USER: Ok, let me know the status of availability.

ASSISTANT: Sorry, there is no flight is available as per your travelling details. Sorry, for the inconvenience.

USER: Oh! that's sad, thank you for assisting me.

ASSISTANT: Ok, may I know your name please for booking a ticket?

USER: Myself Dorothy Thompson.

ASSISTANT: Thank you for providing such information Dorothy.

USER: Most welcome.