You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Robert Smith here, I am planning a weekend to visit Golden Gate Park with my children.

ASSISTANT: Sounds good. Please provide me your airport codes.

USER: My origin and destination airport codes are from IAH to SFO.

ASSISTANT: Please help me with your journey dates.

USER: I am planning it from 06/13 to 06/15.

ASSISTANT: Please hold on a minute.

USER: Sure.

ASSISTANT: There are no flights available right now with your preferences, Smith.

USER: Ok, no problem.

ASSISTANT: Thank you.

USER: Thank you for the information provided.

ASSISTANT: You are welcome.