You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Donna Smith. Can you help me to book a connecting flight from IAH to LAX?

ASSISTANT: Sure, I am here to help you. Can you please provide your journey dates?

USER: My travelling dates are 22 and 24 of Feb.

ASSISTANT: Do you have any class preference?

USER: No, I would like to depart in the evening.

ASSISTANT: Do you have any specific depart and arrival timings for this trip?

USER: I would like to depart in the evening.

ASSISTANT: Donna Smith, there are no flight services are available on this route on your provided dates.

USER: Oh! very sad to hear, thank you.

ASSISTANT: Thank you for contacting us.