You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you for the day?

USER: I am Melissa Campbell, can you help me to book a flight from LAS to IAH?

ASSISTANT: Sure, may I know your travel dates?

USER: My travelling dates are Apr 08 and 10.

ASSISTANT: Ok, please wait a minute.

USER: Ok.

ASSISTANT: Sorry, there were no flights found on your route.

USER: No issues, thank you for your time.

ASSISTANT: Thank you.