You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am planning to visit Houston to meet my grandfather, can you please book me a ticket from JFK to IAH?

ASSISTANT: Sure, I will help you out. Please provide me your travel dates.

USER: My preferable journey dates are from 02/25 to 02/27.

ASSISTANT: May I know your name?

USER: My name is Alexander Mitchell.

ASSISTANT: Sorry Alexander, no flights are available in your route.

USER: Ok, not an issue. I will find any other mode of transport for this trip.

ASSISTANT: Thank you for reaching us.

USER: Thank you.