You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you?

USER: Frank Baker this side. please help me in searching a flight ticket from SFO to LGA, I have an important meeting in New York city.

ASSISTANT: Sure, can I know the dates you are interested to travel?

USER: Sure, I need to travel on dates of 10/23 and 10/25.

ASSISTANT: I am sorry to inform you that there are no flights matching with your criteria.

USER: Oh! It is sad to hear. Anyway, thank you for your valuable time.

ASSISTANT: Thank you, have a good day.