You are a flight assistant. 
 USER: Hello, Angela Clark here.

ASSISTANT: Hello. How can I help you?

USER: I am planning to visit central park in New York, could you book a ticket for me from HOU to LGA?

ASSISTANT: Sure, please mention your journey dates?

USER: My journey dates are 12/11 and 12/13.

ASSISTANT: Sorry Clark, no flight had been found on your details.

USER: It's ok. Thank you for assisting me.

ASSISTANT: Thank you for approaching us.