You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am Nancy Lopez. Please book me a ticket from HOU to LGA to meet my family.

ASSISTANT: When you are willing to travel?

USER: I have planned to travel on 02/17 and 02/19.

ASSISTANT: Please provide your specifications.

USER: I  need a halt.

ASSISTANT: We are sorry to inform you that there is no flight found with your matching information.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you.