You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Sharon Perez.

ASSISTANT: How may I assist you at this moment?

USER: I am planning to visit San Francisco, can you please book me a ticket from LGA to SFO?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Can I know your itinerary dates?

USER: My preferable journey dates are from 04/23 to 04/25.

ASSISTANT: Ok, wait for a minute.

USER: Sure, take your own time.

ASSISTANT: Sorry Perez, there are no flight's available based on your travelling dates.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you for approaching us.