You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Ruth Parker, want to travel from HOU to LGA. Please help me in booking my ticket.

ASSISTANT: Sure, please provide me your travelling dates.

USER: My travelling dates will be from 07/18 to 07/20.

ASSISTANT: Ok. There is no flight available with these location.

USER: It's ok, not an issue. Thank you for your help.

ASSISTANT: You are welcome.